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Stockholders' Equity Tax Benefit (Expense) on Net Activity (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Tax Benefit (Expense) | $ 4 | $ 1 | $ 3 | $ 27
Pension Plan |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Tax Benefit (Expense) | 0 | 0 | (3) | 4
Other Benefit Plans |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Tax Benefit (Expense) | 0 | 0 | 0 | 29
Derivative Instruments |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Tax Benefit (Expense) | $ 4 | $ 1 | $ 6 | $ (6)

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