Derivative Financial Instruments and Risk Management (Details 2) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Derivatives, Fair Value
Asset Fair Value	$ 112	$ 101
Liability Fair Value	(24)	(23)
Designated derivatives
Derivatives, Fair Value
Asset (Liability) Fair Value	71	71
Designated derivatives | Interest rate contracts | Other assets
Derivatives, Fair Value
Asset Fair Value	77	79
Designated derivatives | Interest rate contracts | Accrued expenses
Derivatives, Fair Value
Liability Fair Value	(6)	(8)
Undesignated derivatives
Derivatives, Fair Value
Asset (Liability) Fair Value	17	7
Undesignated derivatives | Foreign exchange contracts | Other assets
Derivatives, Fair Value
Asset Fair Value	8	5
Undesignated derivatives | Foreign exchange contracts | Accrued expenses
Derivatives, Fair Value
Liability Fair Value	(18)	(15)
Undesignated derivatives | Cross currency contracts | Other assets
Derivatives, Fair Value
Asset Fair Value	$ 27	$ 17