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Income Taxes - Provision for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current:
Federal	$ 281	$ 204	$ 272
State	26	12	18
Foreign	0	9	8
Total current	307	225	298
Deferred:
Federal	(13)	5	(3)
State	(7)	6	(3)
Foreign	1	(1)	0
Total deferred	(19)	10	(6)
Income tax expense	$ 288	$ 235	$ 292

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