Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Summary of Fair Value and Carrying Value of Financial Assets and Liabilities (Detail)

v3.6.0.2
Fair Value Measurements - Summary of Fair Value and Carrying Value of Financial Assets and Liabilities (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Fair Value [Member] | Level 3 [Member] | Credit Facility [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities $ 283 $ 247
Fair Value [Member] | Level 3 [Member] | Non Recourse Notes [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities 718 690
Fair Value [Member] | Level 3 [Member] | Financing Receivable [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 1,017 806
Fair Value [Member] | Level 3 [Member] | Financing Receivables Held-for-Sale [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 58 61
Fair Value [Member] | Level 3 [Member] | Investments Available-for-Sale [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets   29
Fair Value [Member] | Fair Value, Inputs, Level 2 [Member] | Derivative Liabilities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities   1
Fair Value [Member] | Fair Value, Inputs, Level 2 [Member] | Derivative Assets [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 1  
Carrying Value [Member] | Level 3 [Member] | Credit Facility [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities 283 247
Carrying Value [Member] | Level 3 [Member] | Non Recourse Notes [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities 709 680
Carrying Value [Member] | Level 3 [Member] | Financing Receivable [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 1,042 784
Carrying Value [Member] | Level 3 [Member] | Financing Receivables Held-for-Sale [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 58 60
Carrying Value [Member] | Level 3 [Member] | Investments Available-for-Sale [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets   29
Carrying Value [Member] | Fair Value, Inputs, Level 2 [Member] | Derivative Liabilities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities   $ 1
Carrying Value [Member] | Fair Value, Inputs, Level 2 [Member] | Derivative Assets [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets $ 1