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Supplemental financial information - Accumulated other comprehensive income (loss), net of taxes (AOCI) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Total | $ 14,577 | $ 13,333 |  |
AOCI |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Total | (254) | (157) | $ (360) | $ (347)
Net actuarial loss |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Total | (249) | (155) |  |
Prior service cost |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Total | (1) | 0 |  |
Unrealized losses on available-for-sale investments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Total | (3) | 0 |  |
Derivative instruments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Total | $ (1) | $ (2) |  |

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