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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Text Block Supplement [Abstract] |  |  |  |
Other income | [1] | $ 327 | $ 201 | $ 135
Other expense | [2] | (14) | (26) | (37)
Total |  | $ 313 | $ 175 | $ 98
[1] | Other income includes royalty income, reversals of tax interest accruals, interest and lease income, as well as investment gains and losses.
[2] | Other expense includes a portion of pension and other retiree benefit costs, currency gains and losses and miscellaneous items.

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