Income Taxes - Income Source (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Taxes
Domestic	$ 2,211	$ 1,780	$ 2,025
Foreign	138	113	80
Income before income taxes	$ 2,349	$ 1,893	$ 2,105