Fair Value (Schedule of Fair Value Measurements, Liabilities, Using Significant Unobservable Inputs) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning balance, Liabilities	$ 26,000,000	$ 115,000,000
Recorded in Revenue, Liabilities	(10,000,000)	61,000,000
Recorded in Other Comprehensive Income, Liabilities	0	0
Purchases, Liabilities	0	0
Issuances, Liabilities	7,000,000	50,000,000
Sales, Liabilities	0	0
Settlements, Liabilities	(6,000,000)	(64,000,000)
Fair Value, ending balance, Liabilities	17,000,000	162,000,000
Change in Unrealized (Gains) Losses Related to Financial Instruments Held as of end of period	(5,000,000)	39,000,000
Derivative instruments, liabilities | Accrued expenses and other liabilities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning balance, Liabilities	26,000,000	115,000,000
Recorded in Revenue, Liabilities	(10,000,000)	61,000,000
Recorded in Other Comprehensive Income, Liabilities	0
Purchases, Liabilities	0
Issuances, Liabilities	7,000,000	50,000,000
Sales, Liabilities	0
Settlements, Liabilities	(6,000,000)	(64,000,000)
Fair Value, ending balance, Liabilities	17,000,000	162,000,000
Change in Unrealized (Gains) Losses Related to Financial Instruments Held as of end of period	(5,000,000)	39,000,000
Foreign exchange contracts | Accrued expenses and other liabilities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning balance, Liabilities	17,000,000	106,000,000
Recorded in Revenue, Liabilities	(10,000,000)	61,000,000
Recorded in Other Comprehensive Income, Liabilities	0	0
Purchases, Liabilities	0	0
Issuances, Liabilities	7,000,000	50,000,000
Sales, Liabilities	0	0
Settlements, Liabilities	(6,000,000)	(64,000,000)
Fair Value, ending balance, Liabilities	8,000,000	153,000,000
Change in Unrealized (Gains) Losses Related to Financial Instruments Held as of end of period	(5,000,000)	39,000,000
Other | Accrued expenses and other liabilities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning balance, Liabilities	9,000,000	9,000,000
Recorded in Revenue, Liabilities	0	0
Recorded in Other Comprehensive Income, Liabilities	0	0
Purchases, Liabilities	0	0
Issuances, Liabilities	0	0
Sales, Liabilities	0	0
Settlements, Liabilities	0	0
Fair Value, ending balance, Liabilities	9,000,000	9,000,000
Change in Unrealized (Gains) Losses Related to Financial Instruments Held as of end of period	$ 0	$ 0