Fair Value of Financial Assets and Liabilities, Recurring (Details) (Fair Value, Measurements, Recurring [Member], Significant Other Observable Inputs (Level 2) [Member], USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Assets:
Interest rate swaps	$ 9	$ 5
Deferred compensation investments in cash surrender life insurance	97	94
Deferred compensation investments in mutual funds	34	32
Total	188	153
Liabilities:
Foreign exchange contracts - forwards	31	58
Deferred compensation plan liabilities	141	135
Total	172	193
Foreign Exchange Forward [Member]
Assets:
Foreign exchange contracts	43	20
Foreign currency options [Member]
Assets:
Foreign exchange contracts	$ 5	$ 2