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Leases and Lease Commitments - Maturities of Operating Lease Liabilities (Detail)
$ in Millions
Dec. 31, 2018
USD ($)
Operating Leased Assets [Line Items]  
2019 $ 568
2020 486
2021 246
2022 161
2023 132
Thereafter 392
Total lease payments 1,985
Less: Interest (209)
Operating lease, liability 1,776
Accounts Payable and Accrued Liabilities  
Operating Leased Assets [Line Items]  
Operating lease, liability 551
Other Liabilities  
Operating Leased Assets [Line Items]  
Operating lease, liability $ 1,225