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Leases - Supplemental Information Related to Leases (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Leases [Abstract]      
Cash paid for amounts included in the measurement of lease liabilities, operating cash flows from finance leases $ 13    
Cash paid for amounts included in the measurement of lease liabilities, operating cash flows from operating leases 115    
Cash paid for amounts included in the measurement of lease liabilities, financing cash flows from finance leases 32 $ 8 $ 6
Right-of-use assets obtained in exchange for new:      
Right-of-use assets obtained in exchange for new operating lease liabilities 53    
Right-of-use assets obtained in exchange for new finance lease liabilities $ 12    
Weighted average remaining lease term (years), operating leases 10 years    
Weighted average remaining lease term (years), finance leases 16 years    
Weighted average remaining lease term, operating leases 4.48%    
Weighted average discount rate, finance leases 4.58%