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Supplemental financial information - Amounts Reclassified out of AOCI (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Other income (expense), net (OI&E) |  | $ 34 | $ 23 | $ 122 | $ 75
Provision for income taxes |  | (155) | (354) | (524) | (842)
Net income |  | 1,425 | 1,570 | 3,947 | 4,341
Reclassification out of Accumulated Other Comprehensive Income | Net actuarial losses of defined benefit plans |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Other income (expense), net (OI&E) | [1] | 12 | 20 | 40 | 43
Provision for income taxes |  | (3) | (5) | (10) | (10)
Net income |  | 9 | 15 | 30 | 33
Reclassification out of Accumulated Other Comprehensive Income | Prior service credit of defined benefit plans |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Other income (expense), net (OI&E) | [1] | 0 | (1) | 0 | (3)
Provision for income taxes |  | 0 | 0 | 0 | 0
Net income |  | $ 0 | $ (1) | $ 0 | $ (3)
[1] | Detailed in Note 6.

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