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Income Taxes - Carryforward (Detail)
$ in Millions
Dec. 31, 2020
USD ($)
Federal [Member]  
Income Taxes  
Net operating loss carry-forwards $ 15
State [Member]  
Income Taxes  
Net operating loss carry-forwards 2,300
Tax credit carry-forward 16
Foreign [Member]  
Income Taxes  
Tax credit carry-forward $ 37