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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Taxes calculated at federal rate	$ 345	$ 194	$ 190
State taxes, net of federal benefit	48	22	18
Change in liability for tax positions	0	0	(14)
Foreign income taxed at different rates	1	5	1
Unremitted foreign earnings	1	(2)	3
Other items, net	(2)	4	(3)
Income tax	$ 393	$ 223	$ 195
Federal income tax rates	21.00%	21.00%	21.00%
State taxes, net of federal benefit	2.90%	2.40%	2.00%
Change in liability for tax positions	0.00%	0.00%	(1.50%)
Foreign income taxed at different rates	0.10%	0.60%	0.10%
Unremitted foreign earnings	0.10%	(0.20%)	0.30%
Other items, net	(0.20%)	0.30%	(0.30%)
Income tax	23.90%	24.10%	21.60%

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