Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Valuation Allowances and Reserves, Period Increase (Decrease)	$ 58,000,000	$ (43,000,000)
Valuation Allowances and Reserves, Balance	229,000,000	287,000,000
Income tax loss carryforwards	1,200,000,000
Income tax loss carryforwards expire amount	532,000,000
Income tax loss carryforwards expiration dates	2012 through 2031
Remaining amount of loss carryforwards that has no expiration date	656,000,000
Unremitted earnings	8,400,000,000
Unrecognized tax benefits	383,000,000	474,000,000	488,000,000
Unrecognized tax benefits in income tax expense	9,000,000	8,000,000	2,000,000
Total accrued penalties and net accrued interest	25,000,000	15,000,000
Aggregate resolution of uncertainties	200,000,000
Year federal income tax returns have been audited	2007
Administrative appeals or litigation	1999 to 2007
Pending refund actions, period	two
State and Local Jurisdiction [Member]
Statute for potential adjustments, period	3 to 5 years
Impact on Earnngs [Member]
Valuation Allowances and Reserves, Period Increase (Decrease)	$ (36,000,000)	$ (25,000,000)