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Stockholders' Equity Reclassifications out of AOCI (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Amounts Reclassified from Accumulated Other Comprehensive Loss | $ (157) |  | $ 22 |  | $ (303) | $ 29
Other Benefit Plans |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Amortization of Prior Service Benefit | (231) | [1],[2] | 0 | [1],[2] | (461) | 0
Pension Plan |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Amounts Reclassified from Accumulated Other Comprehensive Loss |  |  |  |  | 21 | 3
Other Benefit Plans |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Amounts Reclassified from Accumulated Other Comprehensive Loss |  |  |  |  | (318) | 0
Derivative Instruments |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income (Loss), Current Period, before Tax | (10) | [3] | 28 | [3] | (15) | 35
Reclassification from Accumulated Other Comprehensive Loss, Current Period, Tax | 3 | [4] | (7) | [4] | 2 | (9)
Amounts Reclassified from Accumulated Other Comprehensive Loss | (7) |  | 21 |  | (13) | 26
Actuarial (Gains) Losses | Pension Plan |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income (Loss), Current Period, before Tax | 13 | [1],[2] | 1 | [1],[2] | 27 | 2
Actuarial (Gains) Losses | Other Benefit Plans |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income (Loss), Current Period, before Tax | 24 | [1],[2] | 0 | [1],[2] | 47 | 0
Settlement Loss | Pension Plan |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income (Loss), Current Period, before Tax | 0 | [1],[2] | 1 | [1],[2] | 1 | 3
Accumulated Defined Benefit Plans Adjustment Attributable to Parent | Pension Plan |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income (Loss), Current Period, before Tax | 12 |  | 1 |  | 27 | 4
Reclassification from Accumulated Other Comprehensive Loss, Current Period, Tax | (3) | [4] | 0 | [4] | (6) | (1)
Amounts Reclassified from Accumulated Other Comprehensive Loss | 9 |  | 1 |  | 21 | 3
Accumulated Defined Benefit Plans Adjustment Attributable to Parent | Other Benefit Plans |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income (Loss), Current Period, before Tax | (208) |  | 0 |  | (415) | 0
Reclassification from Accumulated Other Comprehensive Loss, Current Period, Tax | 48 | [4] | 0 | [4] | 97 | 0
Amounts Reclassified from Accumulated Other Comprehensive Loss | (160) |  | 0 |  | (318) | 0
Unrealized loss on investments |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Loss, Current Period, Tax | 0 | [4] | 0 | [4] | 0 | 0
Amounts Reclassified from Accumulated Other Comprehensive Loss | 1 | [1] | 0 | [1] | 7 | 0
Prior Service Benefit | Pension Plan |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income (Loss), Current Period, before Tax | (1) |  | (1) |  | (1) | (1)
Accumulated Defined Benefit Plans Adjustment, Curtailment Gain (Loss) | Other Benefit Plans |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income (Loss), Current Period, before Tax | $ (1) |  | $ 0 |  | $ (1) | $ 0
[1] | Reflected in other income - net.
[2] | These accumulated other comprehensive (loss) income components are included in the computation of net periodic benefit credit of the company's pension and other benefit plans. See Note 15 - Pension Plans and Other Post Employment Benefits, for additional information.
[3] | Reflected in cost of goods sold.
[4] | Reflected in provision for income taxes from continuing operations.

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