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Income Taxes - Income Source (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Taxes      
Domestic $ 2,235 $ 2,040 $ 1,681
Foreign 141 151 141
Income before income taxes $ 2,376 $ 2,191 $ 1,822