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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2021
Equity [Abstract] |
Changes in Balance of Accumulated Other Comprehensive Loss, Net of Income Taxes | Changes in the balance of AOCL, net of taxes, consisted of the following (in millions):
|  | Postretirement Benefit Plans (a) |  | Other, net |  | AOCL
Balance at December 31, 2018 |  | $ | (14,254) |  |  | $ | (67) |  |  | $ | (14,321) |
Other comprehensive (loss) income before reclassifications |  | (2,182) |  |  | 18 |  |  | (2,164) |
Amounts reclassified from AOCL |  |  |  |  |  |
Recognition of net actuarial losses |  | 1,148 |  |  | — |  |  | 1,148 |
Amortization of net prior service credits |  | (240) |  |  | — |  |  | (240) |
Other |  | — |  |  | 23 |  |  | 23 |
Total reclassified from AOCL |  | 908 |  |  | 23 |  |  | 931 |
Total other comprehensive (loss) income |  | (1,274) |  |  | 41 |  |  | (1,233) |
Balance at December 31, 2019 |  | (15,528) |  |  | (26) |  |  | (15,554) |
Other comprehensive (loss) income before reclassifications |  | (1,067) |  |  | 56 |  |  | (1,011) |
Amounts reclassified from AOCL |  |  |  |  |  |
Recognition of net actuarial losses |  | 689 |  |  | — |  |  | 689 |
Amortization of net prior service credits |  | (249) |  |  | — |  |  | (249) |
Other |  | — |  |  | 4 |  |  | 4 |
Total reclassified from AOCL |  | 440 |  |  | 4 |  |  | 444 |
Total other comprehensive (loss) income |  | (627) |  |  | 60 |  |  | (567) |
Balance at December 31, 2020 |  | (16,155) |  |  | 34 |  |  | (16,121) |
Other comprehensive income before reclassifications |  | 3,404 |  |  | (85) |  |  | 3,319 |
Amounts reclassified from AOCL |  |  |  |  |  |
Pension settlement charge (b) |  | 1,310 |  |  |  |  | 1,310 |
Recognition of net actuarial losses |  | 733 |  |  | — |  |  | 733 |
Amortization of net prior service credits |  | (256) |  |  | — |  |  | (256) |
Other |  | — |  |  | 9 |  |  | 9 |
Total reclassified from AOCL |  | 1,787 |  |  | 9 |  |  | 1,796 |
Total other comprehensive income (loss) |  | 5,191 |  |  | (76) |  |  | 5,115 |
Balance at December 31, 2021 |  | $ | (10,964) |  |  | $ | (42) |  |  | $ | (11,006) |
(a)AOCL related to postretirement benefit plans is shown net of tax benefits of $3.0 billion at December 31, 2021, $4.4 billion at December 31, 2020 and $4.2 billion at December 31, 2019. 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 10 – Income Taxes” and “Note 12 – Postretirement Benefit Plans” for more information on our income taxes and postretirement benefit plans. (b)During 2021, we recognized a noncash pension settlement charge of $1.7 billion ($1.3 billion after-tax) related to the accelerated recognition of actuarial losses included in AOCL for certain defined benefit pension plans that purchased a group annuity contract from an insurance company (see “Note 12 – Postretirement Benefit Plans”).

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