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Supplemental financial information - Other long-term liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure Text Block Supplement [Abstract] |  |
Long-term portion of transition tax on indefinitely reinvested earnings | $ 457 | $ 506
Deferred compensation plans | 350 | 298
Operating lease liabilities | 249 | 259
Uncertain tax positions | 89 | 303
Other | 160 | 148
Total | $ 1,305 | $ 1,514

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