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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Statement of Comprehensive Income [Abstract] |  |  |  |
Net income | $ 6,699 | $ 5,991 | [1] | $ 6,328
Investment securities, available-for-sale: |  |  |  |
Net unrealized gain (loss) | 60 | 51 |  | (21)
Income tax effect | (24) | (18) |  | 8
Reclassification adjustment for net loss (gain) realized in net income | 1 | (3) |  | (21)
Income tax effect | 0 | 1 |  | 8
Defined benefit pension and other postretirement plans: |  |  |  |
Net unrealized actuarial gain (loss) and prior service credit | 183 | (106) |  | (122)
Income tax effect | (54) | 36 |  | 45
Amortization of actuarial loss (gain) and prior service credit realized in net income | 32 | 10 |  | (1)
Income tax effect | (12) | (4) |  | 1
Derivative instruments classified as cash flow hedges: |  |  |  |
Net unrealized (loss) gain | (22) | (74) |  | 172
Income tax effect | 15 | 9 |  | (51)
Reclassification adjustment for net loss (gain) realized in net income | 33 | (103) |  | (102)
Income tax effect | (12) | 35 |  | 26
Foreign currency translation adjustments | 1,136 | (218) |  | 1
Other comprehensive income (loss), net of tax | 1,336 | (384) |  | (57)
Comprehensive income | $ 8,035 | $ 5,607 |  | $ 6,271
[1] | See Note 2—Visa Europe.

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