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Consolidated Statements of Comprehensive Income - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Statement of Comprehensive Income [Abstract] |  |  |  |
Net income | $ 968 | $ 798 | $ 2,415 | $ 2,150
Net actuarial gains (losses) of defined benefit plans: |  |  |  |
Adjustments | (17) | (33) | (47) | (43)
Recognized within Net income | 12 | 13 | 39 | 40
Prior service (cost) credit of defined benefit plans: |  |  |  |
Adjustments | 0 | 20 | 1 | 20
Recognized within Net income | (1) | 0 | (3) | 1
Derivative instruments: |  |  |  |
Recognized within Net income | 0 | 1 | 0 | 1
Other comprehensive income (loss) | (6) | 1 | (10) | 19
Total comprehensive income | $ 962 | $ 799 | $ 2,405 | $ 2,169

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- Definition Amount after tax of cost (credit) of benefit changes attributable to plan participants' prior service resulting from a plan amendment or plan initiation that has not been recognized in net periodic benefit cost (credit). + References Reference 1: 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=66004124&loc=SL7669646-108580 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=65897934&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 11 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Prior Service Cost -URI http://asc.fasb.org/extlink&oid=49177896 + Details
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