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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Oct. 31, 2012 Subsequent Event	Sep. 30, 2012 IRS Examination
Effective Tax Rate
Income before income taxes	$ 564	$ 666	$ 1,186	$ 1,378
Provision for income taxes at federal statutory rate of 35%	197	233	415	482
Increase (decrease) in income tax from:
State tax - net of federal benefit	10	31	30	61
Property-related	(19)	(18)	(39)	(38)
Other	(12)	(1)	(22)	(9)
Total income tax expense	176	245	384	496
Effective tax rate (as a percent)	31.00%	37.00%	32.00%	36.00%
Federal statutory rate (as a percent)	35.00%	35.00%	35.00%	35.00%
Reconciliation of Unrecognized Tax Benefits
Beginning balance			373	329
Tax positions taken during the current year, Increases			23	58
Tax positions taken during a prior year, Increases			154	44
Tax positions taken during a prior year, Decreases			(33)	(34)
Decreases for settlements during the period			0	0
Ending balance	517	397	517	397
Estimated potential future federal tax payment as of the balance sheet date, including interest and penalties, based on a proposed adjustment						95
Potential earnings benefit attributable to flow through treatment of vintage year activity					$ 230

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A ratio calculated as follows: income tax expense from continuing operations attributable to common shareholders divided by pretax income from continuing operations attributable to common shareholders.

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