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Other income (Narrative) (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Other Income [Line Items]          
Total other income $ 233 $ 64 $ 41 $ 297 $ 84