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Income Taxes - Reconciliation Of Statutory Rate To Effective Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Amount
Federal income tax at statutory rate	$ 487	$ 867	$ 814
State income taxes, net of federal tax effect	65	143	139
Tax credits	(27)	(10)	(10)
State law changes	0	(136)	(34)
Other, net	(32)	(4)	(36)
Income taxes	$ 493	$ 860	$ 873
Percent
Federal income tax at statutory rate	21.00%	21.00%	21.00%
State income taxes, net of federal tax effect	2.90%	3.50%	3.60%
Tax credits	(1.20%)	(0.20%)	(0.30%)
State law changes	0.00%	(3.30%)	(0.80%)
Other, net	(1.40%)	(0.20%)	(1.00%)
Effective income taxes rate	21.30%	20.80%	22.50%

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