Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Mar. 31, 2011	Jun. 30, 2012	Jun. 30, 2011
Permanently Invested Foreign Earnings [Line Items]
Increase to shareholders' net income for change in foreign tax practices		$ 22	$ 15
Unrecognized deferred tax liabilities related to permanently invested foreign earnings		90
Unrecognized Tax Benefits Period Increase (Decrease)		5
Increase (decrease) to net income resulting from change in gross unrecognized tax benefits		(4)
Effect of IRS examination to shareholders' net income	24
Reduction in net unrecognized tax benefit resulting from IRS examination	11
Income tax benefit related to IRS examination	33
Pre-tax charge associated with IRS examination	9
Reduction of interest and penalties resulting from IRS examination	11
Accounting Standards Update 2010-26 [Member] | Restatement Adjustment [Member]
Permanently Invested Foreign Earnings [Line Items]
Unrecognized deferred tax liabilities related to permanently invested foreign earnings		(9)
China And Indonesia [Member] | Implementation Effect [Member]
Permanently Invested Foreign Earnings [Line Items]
Increase to shareholders' net income for change in foreign tax practices		$ 13