Fair Value of Financial Assets and Liabilities, Recurring (Details) - Fair Value, Measurements, Recurring [Member] - Significant Other Observable Inputs (Level 2) [Member] - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Assets:
Interest rate swaps	$ 12	$ 5
Deferred compensation investments in cash surrender life insurance	92	94
Deferred compensation investments in mutual funds	33	32
Total	184	153
Liabilities:
Deferred compensation plan liabilities	124	135
Total	157	193
Foreign Exchange Forward [Member]
Assets:
Foreign exchange contracts	46	20
Liabilities:
Foreign exchange contracts - forwards	31	58
Currency options [Member]
Assets:
Foreign exchange contracts	1	2
Foreign Exchange Option [Member]
Liabilities:
Foreign exchange contracts - forwards	$ 2	$ 0