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Supplemental financial information - Other income (expense), net (OI&E) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure Text Block Supplement [Abstract] |  |  |  |
Other income | [1] | $ 145 | $ 327 | $ 201
Other expense | [2] | (2) | (14) | (26)
Total |  | $ 143 | $ 313 | $ 175
[1] | Other income includes royalty and lease income, investment gains and losses, interest income, as well as reversals of tax interest accruals.
[2] | Other expense includes a portion of pension and other retiree benefit costs, currency gains and losses and miscellaneous items.

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