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Leases - Supplemental cash flow information related to leases (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows from operating leases $ 151 $ 169
Right-of-use assets obtained in exchange for lease obligations (non-cash):    
Operating leases $ 211 $ 142