Commercial Paper and Long-Term Debt Fair Value Hedges Effect of Changes in Fair Value Hedges on Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Net impact on the Company’s Consolidated Statements of Operations	$ 0	$ 0	$ 0	$ 0
Interest Rate Swap [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Hedge - interest rate swap (loss) gain recognized in interest expense	(208)	67	14	133
Debt [Member] | Interest Rate Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Hedged item - long-term debt gain (loss) recognized in interest expense	$ 208	$ (67)	$ (14)	$ (133)