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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Statement of Comprehensive Income [Abstract] |  |  |  |
Net income | $ 3,084 | $ 2,977 | $ 6,356 | $ 5,954
Investment securities: |  |  |  |
Net unrealized gain (loss) | 5 | 7 | 5 | 15
Income tax effect | (1) | (2) | (1) | (4)
Reclassification adjustments | (2) | 0 | (2) | 0
Defined benefit pension and other postretirement plans: |  |  |  |
Net unrealized actuarial gain (loss) and prior service credit (cost) | 3 | 0 | 2 | (7)
Income tax effect | (1) | 0 | (1) | 1
Reclassification adjustments | 2 | 0 | 6 | 0
Income tax effect | 0 | 0 | (1) | 0
Derivative instruments: |  |  |  |
Net unrealized gain (loss) | 47 | 59 | (141) | 97
Income tax effect | (8) | (13) | 31 | (23)
Reclassification adjustments | (13) | (22) | (15) | (47)
Income tax effect | 3 | 4 | 4 | 9
Foreign currency translation adjustments | (139) | (394) | 344 | (681)
Other comprehensive income (loss), net of tax | (104) | (361) | 231 | (640)
Comprehensive income | $ 2,980 | $ 2,616 | $ 6,587 | $ 5,314

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