Derivative Financial Instruments and Risk Management (Details 2) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Designated derivatives
Derivatives, Fair Value [Line Items]
Asset (Liability) Fair Value	$ 237	$ 242
Designated derivatives | Interest rate contracts | Other assets
Derivatives, Fair Value [Line Items]
Asset Fair Value	244	248
Designated derivatives | Interest rate contracts | Accrued expenses
Derivatives, Fair Value [Line Items]
Liability Fair Value	(7)	(6)
Undesignated derivatives
Derivatives, Fair Value [Line Items]
Asset (Liability) Fair Value	(2)	(10)
Undesignated derivatives | Foreign exchange contracts | Other assets
Derivatives, Fair Value [Line Items]
Asset Fair Value	11	7
Undesignated derivatives | Foreign exchange contracts | Accrued expenses
Derivatives, Fair Value [Line Items]
Liability Fair Value	(11)	(16)
Undesignated derivatives | Interest rate contracts | Accrued expenses
Derivatives, Fair Value [Line Items]
Liability Fair Value	$ (2)	$ (1)