Fair Value of Financial Assets and Liabilities - Recurring (Details) - Fair Value, Measurements, Recurring [Member] - Significant Other Observable Inputs (Level 2) [Member] - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Assets:
Interest rate swaps	$ 5	$ 4
Deferred compensation investments in mutual funds	16	15
Total	24	107
Liabilities:
Deferred compensation plan liabilities	18	17
Total	77	56
Foreign Exchange Forward [Member]
Assets:
Foreign exchange contracts	3	88
Liabilities:
Foreign exchange contracts	$ 59	$ 39