Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Deferred tax asset amount related to accumulated other comprehensive income	$ 2,100,000,000	$ 1,600,000,000
Investment of U.S. government accounts receivable in the CCF	684,000,000	683,000,000
Net operating and capital loss carryforwards	1,400,000,000
R&D and investment tax credit carryforwards	204,000,000
Earnings from continuing operations before income taxes included foreign income	(194,000,000)	473,000,000	640,000,000
Earnings from non-U.S. subsidiaries not remitted to the United States	1,600,000,000
Statutory federal income tax rate	35.00%	35.00%	35.00%
Possible chance of tax position sustainable, percentage	50.00%
Tax positions for which it is reasonably possible that the unrecognized tax benefits will significantly increase or decrease	$ 0