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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2014 | Mar. 31, 2013
Net income | $ 1,598 | $ 1,270 | $ 3,005 | $ 2,563
Investment securities, available-for-sale: |  |  |  |
Net unrealized gain | 11 | 2 | 28 | 50
Income tax effect | (4) |  | (10) | (17)
Reclassification adjustment for net gain realized in net income |  | (1) |  | (1)
Defined benefit pension and other postretirement plans: |  |  |  |
Net unrealized actuarial loss and prior service credit | (8) | (3) | (7) | (3)
Income tax effect | 3 | 1 | 3 | 1
Amortization of actuarial (gain) loss and prior service credit realized in net income | (5) | 5 | (7) | 8
Income tax effect | 2 | (2) | 3 | (3)
Derivative instruments classified as cash flow hedges: |  |  |  |
Net unrealized (loss) gain | (7) | 6 | 17 | 15
Income tax effect | 1 |  | (3) |
Reclassification adjustment for net gain realized in net income | (12) | (6) | (23) | (17)
Income tax effect | 2 | 2 | 4 | 5
Other comprehensive (loss) income, net of tax | (17) | 4 | 5 | 38
Comprehensive income | $ 1,581 | $ 1,274 | $ 3,010 | $ 2,601

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- Definition Amount before tax of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) related to pension and other postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669646-108580 + Details
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- Definition Amount of tax (expense) benefit of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) related to pension and other postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e689-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e640-108580 + Details
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