Derivative Financial Instruments and Risk Management (Details 2) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Derivatives, Fair Value
Asset Fair Value	$ 22	$ 72
Liability Fair Value	(68)	(8)
Designated derivatives
Derivatives, Fair Value
Asset (Liability) Fair Value	(49)	29
Designated derivatives | Interest rate contracts | Other assets
Derivatives, Fair Value
Asset Fair Value	3	4
Designated derivatives | Interest rate contracts | Accrued expenses
Derivatives, Fair Value
Liability Fair Value	(2)	(1)
Designated derivatives | Cross currency contracts | Other assets
Derivatives, Fair Value
Asset Fair Value	7	29
Designated derivatives | Cross currency contracts | Accrued expenses
Derivatives, Fair Value
Liability Fair Value	(57)	(3)
Undesignated derivatives
Derivatives, Fair Value
Asset (Liability) Fair Value	3	35
Undesignated derivatives | Foreign exchange contracts | Other assets
Derivatives, Fair Value
Asset Fair Value	12	12
Undesignated derivatives | Foreign exchange contracts | Accrued expenses
Derivatives, Fair Value
Liability Fair Value	(9)	(4)
Undesignated derivatives | Cross currency contracts | Other assets
Derivatives, Fair Value
Asset Fair Value	$ 0	$ 27