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Leases - Supplemental Information Related to Leases (Detail)
$ in Millions
 3 Months Ended
Mar. 31, 2019
USD ($)
Leases [Abstract]  
Cash paid for amounts included in the measurement of lease liabilities, operating cash flows from finance leases $ 4
Cash paid for amounts included in the measurement of lease liabilities, operating cash flows from operating leases 33
Cash paid for amounts included in the measurement of lease liabilities, financing cash flows from finance leases 7
Right-of-use assets obtained in exchange for new finance lease liabilities 6
Right-of-use assets obtained in exchange for new operating lease liabilities $ 31
Weighted average remaining lease term (years), finance leases 17 years
Weighted average remaining lease term (years), operating leases 10 years
Weighted average discount rate, finance leases 5.53%
Weighted average remaining lease term, operating leases 5.03%