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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure Text Block Supplement [Abstract] |  |  |  |
Other income | [1] | $ 197 | $ 150 | $ 163
Other expense | [2] | (22) | (52) | (88)
Total |  | $ 175 | $ 98 | $ 75
[1] | Other income includes interest, royalty and lease income, as well as investment gains and losses.
[2] | Other expense includes a portion of pension and other retiree benefit costs. It also includes currency gains and losses, tax interest and miscellaneous items.

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