Fair Value of Financial Assets and Liabilities - Recurring (Details) - USD ($) $ in Millions		Dec. 31, 2015	Dec. 31, 2014
Assets:
Interest Rate Derivatives, at Fair Value, Net	[1]	$ 7	$ 5
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Interest Rate Derivatives, at Fair Value, Net		7	5
Deferred compensation investments in cash surrender life insurance		92	94
Deferred compensation investments in mutual funds		33	32
Total		187	153
Liabilities:
Foreign exchange contracts - forwards		12	58
Deferred compensation plan liabilities		125	135
Total		138	193
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Foreign exchange contracts - forwards [Member]
Assets:
Foreign exchange contracts - forwards		55	20
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Options Held [Member]
Assets:
Foreign exchange contracts - forwards		0	2
Liabilities:
Foreign exchange contracts - forwards		$ 1
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Currency Swap [Member]
Liabilities:
Foreign exchange contracts - forwards			$ 0

[1] Fair value adjustments include the following: (i) fair value adjustments to debt associated with terminated interest rate swaps, which are being amortized to interest expense over the remaining term of the related notes; and (ii) changes in fair value of hedged debt obligations attributable to movements in benchmark interest rates. Hedge accounting requires hedged debt instruments to be reported inclusive of any fair value adjustment.