Income Taxes (Operating and Capital Loss Carryforwards) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011		Dec. 31, 2010
Domestic Country [Member]
Operating Loss Carryforwards [Line Items]
Net Operating And Capital Loss Carryforwards	$ 1,112	[1]	$ 812
Foreign Country [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	1,241	[2]	405
Foreign Country [Member] | Operating Loss Expiring Between 2014 And 2020 [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	1,208
Foreign Country [Member] | Net Operating Loss Indefinite Life [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	33
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Net Operating And Capital Loss Carryforwards	$ 6,106	[3]	$ 5,330

[1] Expires between 2020 and 2031.

[2] $1,208 million expires between 2014 and 2020 and $33 million has an unlimited carryforward.

[3] Expires between 2012 and 2031.