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Income Taxes - Income Source (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Taxes
Domestic	$ 1,780	$ 2,025	$ 2,235
Foreign	113	80	141
Income before income taxes	$ 1,893	$ 2,105	$ 2,376

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The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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