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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Changes in Balance of Accumulated Other Comprehensive Loss, Net of Income Taxes | Changes in the balance of AOCL, net of income taxes, consisted of the following (in millions):
|  | Postretirement Benefit Plans (a) |  | Other, net |  |  | AOCL |
Balance at December 31, 2014 |  | $ | (11,813 | ) |  | $ | (57 | ) |  | $ | (11,870 | )
Other comprehensive loss before reclassifications |  | (351 | ) |  | (73 | ) |  | (424 | )
Amounts reclassified from AOCL |  |  |  |  |  |
Recognition of net actuarial losses |  | 1,109 |  |  | — |  |  | 1,109 |
Amortization of net prior service credits |  | (259 | ) |  | — |  |  | (259 | )
Total reclassified from AOCL |  | 850 |  |  | — |  |  | 850 |
Total other comprehensive income (loss) |  | 499 |  |  | (73 | ) |  | 426 |
Balance at December 31, 2015 |  | (11,314 | ) |  | (130 | ) |  | (11,444 | )
Other comprehensive loss before reclassifications |  | (1,232 | ) |  | — |  |  | (1,232 | )
Amounts reclassified from AOCL |  |  |  |  |  |
Recognition of net actuarial losses |  | 938 |  |  | — |  |  | 938 |
Amortization of net prior service credits |  | (239 | ) |  | — |  |  | (239 | )
Recognition of net prior service credits from divestiture of IS&GS segment (b) |  | (134 | ) |  | — |  |  | (134 | )
Other |  | — |  |  | 9 |  |  | 9 |
Total reclassified from AOCL |  | 565 |  |  | 9 |  |  | 574 |
Total other comprehensive (loss) income |  | (667 | ) |  | 9 |  |  | (658 | )
Balance at December 31, 2016 |  | (11,981 | ) |  | (121 | ) |  | (12,102 | )
Other comprehensive (loss) income before reclassifications |  | (1,380 | ) |  | 120 |  |  | (1,260 | )
Amounts reclassified from AOCL |  |  |  |  |  |
Recognition of net actuarial losses |  | 1,030 |  |  | — |  |  | 1,030 |
Amortization of net prior service credits |  | (228 | ) |  | — |  |  | (228 | )
Other |  | — |  |  | 20 |  |  | 20 |
Total reclassified from AOCL |  | 802 |  |  | 20 |  |  | 822 |
Total other comprehensive (loss) income |  | (578 | ) |  | 140 |  |  | (438 | )
Balance at December 31, 2017 |  | $ | (12,559 | ) |  | $ | 19 |  |  | $ | (12,540 | )
(a) | AOCL related to postretirement benefit plans is shown net of tax benefits of $6.5 billion at both December 31, 2017 and 2016 and $6.2 billion at December 31, 2015. These tax benefits include amounts recognized on our income tax returns as current deductions and deferred income taxes, which will be recognized on our tax returns in future years. See “Note 9 – Income Taxes” and “Note 11 – Postretirement Benefit Plans” for more information on our income taxes and postretirement benefit plans.
(b) | Associated with the 2016 divestiture of the IS&GS business and included in net gain on divestiture of discontinued operations.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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