Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Tax Contingency [Line Items]
Income tax benefit associated with the extraordinary loss			$ 2,410,000,000
Income tax expense (benefit) related to net gains (losses) from sales of investment securities	55,000,000	(98,000,000)	147,000,000
Income (loss) from continuing operations before income taxes, foreign	1,700,000,000	1,340,000,000	801,000,000
Investment of retained earnings	2,200,000,000
Deferred tax assets, operating loss carryforwards	34,000,000	26,000,000
Tax positions for which the ultimate deductibility is highly certain but time is uncertain	112,000,000
Interest and penalties expense			3,000,000
Interest expense	10,000,000
Interest accrued	8,000,000	65,000,000
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities	1,000,000	33,000,000
IRS Audit Of The Tax Years 2000 - 2006 [Member]
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities	$ 44,000,000
Maximum [Member]
Income Tax Contingency [Line Items]
Operating loss carryforwards expiration dates	2031
Minimum [Member]
Income Tax Contingency [Line Items]
Operating loss carryforwards expiration dates	2012