Quarterly report pursuant to Section 13 or 15(d)

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

v3.5.0.2
Fair Value Measurements - Summary of Fair Value and Carrying Value of Financial Assets and Liabilities (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Fair Value [Member] | Level 3 [Member] | Credit Facilities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities $ 356 $ 247
Fair Value [Member] | Level 3 [Member] | Nonrecourse Debt [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities 649 690
Fair Value [Member] | Level 3 [Member] | Financing Receivable [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 914 806
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 7 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 50 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 6 1
Carrying Value [Member] | Level 3 [Member] | Credit Facilities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities 356 247
Carrying Value [Member] | Level 3 [Member] | Nonrecourse Debt [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities 624 680
Carrying Value [Member] | Level 3 [Member] | Financing Receivable [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 865 784
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 7 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 50 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 $ 6 $ 1