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Financial Instruments - Detailed Information about In Lease Liabilities (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Text block [abstract]      
Lease financial liability at beginning of year $ 1,306 $ 1,315 $ 1,309
Additions From New Leases 213 274 296
Increase Decrease Reductions Of Leases Financial Liabilities From Payments (276) (239) (192)
Increase Decrease Cancellation And Remeasurements Of Lease Financial Liabilities (9) (54) (67)
Increase Decrease Through Foreign Exchange Difference Lease Financial Liabilities 26 10 (31)
Lease financial liability at end of year $ 1,260 $ 1,306 $ 1,315