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Income taxes - Schedule of Effective Income Tax Rate (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Tax Disclosure [Abstract] |  |  |
U.S. statutory rate | $ 843 | $ 727 | $ 651
State tax, net of federal tax benefit | 38 | 73 | 61
Tax rate differentials | (11) | (6) | 4
Uncertain tax positions | 87 | 60 | 75
Tax credits | (125) | (96) | (107)
Non-deductible goodwill impairment | 75 | 0 | 0
Other | 18 | 4 | (34)
Total tax expense | $ 925 | $ 762 | $ 650
Effective income tax rate | 23.00% | 22.00% | 21.00%

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