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Supplemental financial information - Accumulated other comprehensive income (loss), net of taxes (AOCI) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Total | $ 16,897 | $ 14,577 |  |
AOCI |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Total | (205) | (254) | $ (157) | $ (360)
Net actuarial loss |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Total | (207) | (249) |  |
Prior service cost |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Total | 0 | (1) |  |
Unrealized gains (losses) on available-for-sale investments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Total | 2 | (3) |  |
Derivative instruments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Total | $ 0 | $ (1) |  |

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