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Stockholders' Equity Reclassifications out of AOCI (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Amounts Reclassified from Accumulated Other Comprehensive Loss |  | $ (146) | $ 7
Other Benefit Plans |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Amortization of Prior Service Benefit | [1],[2] | (230) | 0
Pension Plan |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Amounts Reclassified from Accumulated Other Comprehensive Loss |  | 12 | 2
Other Benefit Plans |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Amounts Reclassified from Accumulated Other Comprehensive Loss |  | (158) | 0
Derivative Instruments |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassification from Accumulated Other Comprehensive Income (Loss), Current Period, before Tax | [3] | (5) | 7
Reclassification from Accumulated Other Comprehensive Loss, Current Period, Tax | [4] | (1) | (2)
Amounts Reclassified from Accumulated Other Comprehensive Loss |  | (6) | 5
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 | [1],[2] | 14 | 1
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 | [1],[2] | 23 | 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 | [1],[2] | 1 | 2
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 |  | 15 | 3
Reclassification from Accumulated Other Comprehensive Loss, Current Period, Tax | [4] | (3) | (1)
Amounts Reclassified from Accumulated Other Comprehensive Loss |  | 12 | 2
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 |  | (207) | 0
Reclassification from Accumulated Other Comprehensive Loss, Current Period, Tax | [4] | 49 | 0
Amounts Reclassified from Accumulated Other Comprehensive Loss |  | (158) | 0
Unrealized loss on investments |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassification from Accumulated Other Comprehensive Loss, Current Period, Tax | [4] | 0 | 0
Amounts Reclassified from Accumulated Other Comprehensive Loss | [1] | $ 6 | $ 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 (benefit from) income taxes from continuing operations.

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