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	Sep. 30, 2013	Dec. 31, 2012
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Foreign exchange contracts-forwards	$ 11	$ 11
Deferred compensation investments in cash surrender life insurance	85	77
Deferred compensation investments in mutual funds	27	23
Total	123	111
Liabilities:
Foreign exchange contracts-forwards	47	82
Deferred compensation plan liabilities	120	110
Total	$ 167	$ 192