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)

v3.7.0.1
Fair Value Measurements - Summary of Fair Value and Carrying Value of Financial Assets and Liabilities (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Fair Value [Member] | Level 3 [Member] | Credit Facilities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities $ 392 $ 283
Fair Value [Member] | Level 3 [Member] | Non Recourse Notes [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities 951 718
Fair Value [Member] | Level 3 [Member] | Financing Receivable [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 1,129 1,017
Fair Value [Member] | Level 3 [Member] | Investments [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 126 58
Fair Value [Member] | Level 3 [Member] | Securitization Residual Assets [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 28 19
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 Facilities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities 392 283
Carrying Value [Member] | Level 3 [Member] | Non Recourse Notes [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities 943 709
Carrying Value [Member] | Level 3 [Member] | Financing Receivable [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 1,140 1,042
Carrying Value [Member] | Level 3 [Member] | Investments [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 126 58
Carrying Value [Member] | Level 3 [Member] | Securitization Residual Assets [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 28 19
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