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Schedule II - Valuation and Qualifying Accounts (Detail) - Valuation Allowance of Deferred Tax Assets [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year $ 226 $ 200 $ 153
Addition Charged to Expenses 40 23 52
Additions (Deductions)   3 (5)
Balance at End of Year $ 266 $ 226 $ 200