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Consolidated Statements of Comprehensive Income - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statement of Comprehensive Income [Abstract] |  |  |
Net income | $ 3,189 | $ 1,877 | $ 2,171
Changes in: |  |  |
Unrealized net capital gains and losses | 319 | 433 | (1,306)
Unrealized foreign currency translation adjustments | 47 | 10 | (58)
Unrecognized pension and other postretirement benefit cost | 307 | (104) | 48
Other comprehensive income (loss), after-tax | 673 | 339 | (1,316)
Comprehensive income | $ 3,862 | $ 2,216 | $ 855

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e557-108580 + Details
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