Income Taxes (Details 1) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Tax Expense [Line Items]
Current Federal Tax Expense (Benefit)	$ 25	$ (172)	$ 25
Current State and Local Tax Expense (Benefit)	22	26	17
Current Income Tax Expense (Benefit)	47	(146)	42
Deferred Federal Income Tax Expense (Benefit)	318	415	182
Deferred State and Local Income Tax Expense (Benefit)	(98)	42	23
Deferred Income Tax Expense (Benefit)	220	457	205
Income Tax Expense (Benefit), Intraperiod Tax Allocation	$ 267	$ 311	$ 247