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Income Taxes - Reconciliation Of Statutory Rate To Effective Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Amount
Federal income tax at statutory rate	$ 531	$ 733	$ 728
State income taxes, net of federal tax effect	85	110	120
Excess tax benefits on stock-based compensation	(39)	(29)	(22)
Other, net	(60)	(45)	(23)
Income taxes	$ 517	$ 769	$ 803
Percent
Federal income tax at statutory rate	21.00%	21.00%	21.00%
State income taxes, net of federal tax effect	3.30%	3.10%	3.50%
Excess tax benefits associated with stock-based compensation, net of federal tax effect	(1.50%)	(0.80%)	(0.70%)
Other, net	(2.40%)	(1.30%)	(0.70%)
Provision for income taxes	20.40%	22.00%	23.10%

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments.

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