Long-Term Debt - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Cumulative carrying value adjustments on derivative financial instruments	$ 15,000,000	$ 15,000,000
Change in carrying value of foreign debt resulting from translation adjustments	359,000,000	347,000,000
Long-term debt carried at fair value	1,317,000,000	3,257,000,000
Interest Expense for long-term debt for continuing operations	$ 329,000,000	$ 688,000,000	$ 836,000,000
Weighted average interest rate on long-term debt	5.72%	4.77%
Credit facility collateral	$ 3,000,000
Long-term debt collateralized by receivables	404,000,000	$ 879,000,000
Loans pledged as collateral	750,000,000	$ 1,654,000,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Borrowing capacity of credit facility	$ 3,000,000
Credit facility, term	364 days