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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

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