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Leases - Schedule of Supplemental Information Related To Operating Leases (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Leases [Abstract]  
Operating cash flows – cash paid relating to operating leases $ 344
Right-of-use assets obtained in exchange for new operating lease liabilities $ 104
Weighted-average remaining lease term – operating leases, in years 11 years
Weighted-average discount rate – operating leases 4.80%