Annual report pursuant to Section 13 and 15(d)

Long-term Debt - Schedule of Outstanding Non-Recourse Asset-Backed Debt and Bank Loans (Parenthetical) (Detail)

v3.8.0.1
Long-term Debt - Schedule of Outstanding Non-Recourse Asset-Backed Debt and Bank Loans (Parenthetical) (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Asset-Backed Nonrecourse Debt Agreement [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Total collateral pledged against our nonrecourse debt $ 1,545 $ 864