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, 2013	Dec. 31, 2012
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Foreign exchange contracts-forwards	$ 25	$ 11
Deferred compensation investments in cash surrender life insurance	80	77
Deferred compensation investments in mutual funds	25	23
Total	130	111
Liabilities:
Foreign exchange contracts-forwards	65	82
Deferred compensation plan liabilities	113	110
Total	$ 178	$ 192