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Consolidated Statements of Comprehensive Income - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Statement of Comprehensive Income [Abstract] |  |  |  |
Net income | $ 1,425 | $ 1,570 | $ 3,947 | $ 4,341
Net actuarial losses of defined benefit plans: |  |  |  |
Adjustments | 5 | 3 | 0 | 2
Recognized within net income | 9 | 15 | 30 | 33
Prior service credit of defined benefit plans: |  |  |  |
Recognized within net income | 0 | (1) | 0 | (3)
Derivative instruments: |  |  |  |
Change in fair value - post adoption | 0 |  | 0 |
Change in fair value - pre adoption |  | 0 |  | (2)
Other comprehensive income (loss) | 14 | 17 | 30 | 30
Total comprehensive income | $ 1,439 | $ 1,587 | $ 3,977 | $ 4,371

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