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Stockholders' Equity Tax Benefit (Expense) on Net Activity (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Tax Benefit (Expense) | $ 38 | $ (2) | $ 67 | $ (1)
Pension Plan |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Tax Benefit (Expense) | (3) | 1 | (5) | (3)
Other Benefit Plans |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Tax Benefit (Expense) | 48 | 0 | 97 | 0
Derivative Instruments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Tax Benefit (Expense) | $ (7) | $ (3) | $ (25) | $ 2

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