Changes in Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Changes in Other Comprehensive Income [Abstract]
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	$ (16)	$ (26)	$ (58)
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges and Treasury Locks, Effect Net of Tax	141	34	(48)
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	19	41	(32)
Accumulated Other Comprehensive Income (Loss), Net of Tax	106	(33)	(138)
Cumulative Translation Adjustment, Net of Tax, Period Increase (Decrease)	10	32
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Before Reclassifications, Net of Tax	130	59
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments, Net of Tax	31	1
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost Recognized in Net Periodic Pension Cost, Net of Tax	(9)	(10)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	22	(9)	(18)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	171	92
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Reclassified from OCI, Net of Tax	(23)	23
Other Comprehensive Income (Loss), Reclassifications out of OCI, Net of Tax	(32)	13
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	10	32	(8)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	107	82
Other Comprehensive Income (Loss), Net of Tax	139	105	(9)
Other Comprehensive Income (Loss), Tax	77	36
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising Reclassed from OCI, Tax	14	14
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax	15	1
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized (Gain) Loss Arising During Period, Tax	$ 6	$ 8