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Consolidated Statements of Comprehensive Income - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statement of Comprehensive Income [Abstract] |  |  |
Net earnings | $ 2,002 | $ 5,302 | $ 3,605
Postretirement benefit plans |  |  |
Net other comprehensive loss recognized during the period, net of tax benefit of $375 million in 2017, $668 million in 2016 and $192 million in 2015 | (1,380) | (1,232) | (351)
Amounts reclassified from accumulated other comprehensive loss, net of tax expense of $437 million in 2017, $382 million in 2016 and $464 million in 2015 | 802 | 699 | 850
Reclassifications from divestiture of IS&GS business | 0 | (134) | 0
Other, net | 140 | 9 | (73)
Other comprehensive (loss) income, net of tax | (438) | (658) | 426
Comprehensive income | $ 1,564 | $ 4,644 | $ 4,031

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- Definition Actuarial gains (losses) due to differences between actual experience and actuarial assumptions, and prior service credits (costs) from improvements or reductions in plan benefits, each of which occurred during the year and were recognized as a component of other comprehensive income (loss) at the end of the year. + References No definition available. + Details
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