Derivative Financial Instruments and Risk Management (Details 2) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Derivatives, Fair Value
Asset Fair Value	$ 138	$ 238	$ 255
Liability Fair Value	(10)	(15)	(23)
Designated derivatives
Derivatives, Fair Value
Asset (Liability) Fair Value	116	218	242
Designated derivatives | Interest rate contracts | Other assets
Derivatives, Fair Value
Asset Fair Value	122	226	248
Designated derivatives | Interest rate contracts | Accrued expenses
Derivatives, Fair Value
Liability Fair Value	(6)	(8)	(6)
Undesignated derivatives
Derivatives, Fair Value
Asset (Liability) Fair Value	12	5	(10)
Undesignated derivatives | Interest rate contracts | Other assets
Derivatives, Fair Value
Asset Fair Value	0	2	0
Undesignated derivatives | Interest rate contracts | Accrued expenses
Derivatives, Fair Value
Liability Fair Value	0	(1)	(1)
Undesignated derivatives | Foreign exchange contracts | Other assets
Derivatives, Fair Value
Asset Fair Value	7	10	7
Undesignated derivatives | Foreign exchange contracts | Accrued expenses
Derivatives, Fair Value
Liability Fair Value	(4)	(5)	(16)
Undesignated derivatives | Cross currency contracts | Other assets
Derivatives, Fair Value
Asset Fair Value	9	0	0
Undesignated derivatives | Cross currency contracts | Accrued expenses
Derivatives, Fair Value
Liability Fair Value	$ 0	$ (1)	$ 0