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Income Taxes Schedule of Effective Income Tax Rate Reconcillation (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Taxes Schedule of Effective Income Tax Expense (Benefit) [Abstract]
Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate	$ (341)	$ 1,008	$ 1,009
Income Tax Reconciliation, State and Local Income Taxes	(38)	74	78
Income Tax Reconciliation, Other Adjustments	(1)	41	23
Total Income Tax Expense (Benefit)	$ (380)	$ 1,123	$ 1,110

- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

+ References+ Details

- Definition

The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

+ References+ Details