Derivative Financial Instruments and Risk Management (Details 2) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Derivatives, Fair Value
Asset Fair Value	$ 83	$ 22
Liability Fair Value	(39)	(68)
Designated derivatives
Derivatives, Fair Value
Asset (Liability) Fair Value	23	(49)
Designated derivatives | Interest rate contracts | Other assets
Derivatives, Fair Value
Asset Fair Value	6	3
Designated derivatives | Interest rate contracts | Accrued expenses
Derivatives, Fair Value
Liability Fair Value	(3)	(2)
Designated derivatives | Cross currency contracts | Other assets
Derivatives, Fair Value
Asset Fair Value	46	7
Designated derivatives | Cross currency contracts | Accrued expenses
Derivatives, Fair Value
Liability Fair Value	(26)	(57)
Undesignated derivatives
Derivatives, Fair Value
Asset (Liability) Fair Value	21	3
Undesignated derivatives | Foreign exchange contracts | Other assets
Derivatives, Fair Value
Asset Fair Value	26	12
Undesignated derivatives | Foreign exchange contracts | Accrued expenses
Derivatives, Fair Value
Liability Fair Value	(10)	(9)
Undesignated derivatives | Cross currency contracts | Other assets
Derivatives, Fair Value
Asset Fair Value	$ 5	$ 0