Income Taxes (Schedule of Earnings (Loss) from Continuing Operations Before Tax by Jurisdiction) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Income Taxes [Line Items]
US	$ 421		$ 310		$ 214
International	236	[1]	445	[1]	324	[1]
Earnings (loss) from continuing operations before tax	657		755		538
Effective income tax rate	7.00%		20.00%		21.00%
Aggregated Geographical [Member]
Income Taxes [Line Items]
International	$ 320		$ 321		$ 260
Effective income tax rate	5.60%		2.50%		3.70%

[1] Includes aggregate earnings generated by operations in Bermuda, Luxembourg, the Netherlands and Hong Kong of $320 million, $321 million and $260 million for the years ended December 31, 2012, 2011 and 2010, respectively, which have an aggregate effective income tax rate of 5.6%, 2.5% and 3.7% for each year, respectively.