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Other Comprehensive Income (Loss) - Changes in AOCI balance by Component (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020
Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |
Income (Loss) Before Reclassifications |  |  |  |  |  |  |  |  |  |  |  |  | $ 35
Amounts Reclassified to Net Earnings |  |  |  |  |  |  |  |  |  |  |  |  | 41
Tax Expense |  |  |  |  |  |  |  |  |  |  |  |  | (19)
Total Other Comprehensive Income (Loss) | $ 34 |  | $ 20 |  | $ 3 |  | $ 7 |  | $ 4 |  | $ 2 |  | 57
Pension and Other Post-Employment Benefits |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Balance December 31, 2019, Net of Tax |  |  |  |  | (619) |  |  |  |  |  |  |  | (619)
Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |
Income (Loss) Before Reclassifications |  |  |  |  |  |  |  |  |  |  |  |  | 0
Amounts Reclassified to Net Earnings |  |  |  |  |  |  |  |  |  |  |  |  | 38
Tax Expense |  |  |  |  |  |  |  |  |  |  |  |  | (9)
Total Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  | 29
Balance September 30, 2020, Net of Tax | (590) |  |  |  |  |  |  |  |  |  |  |  | (590)
Interest Rate Derivatives |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Balance December 31, 2019, Net of Tax |  |  |  |  | 0 |  |  |  |  |  |  |  | 0
Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |
Income (Loss) Before Reclassifications |  |  |  |  |  |  |  |  |  |  |  |  | 44
Amounts Reclassified to Net Earnings |  |  |  |  |  |  |  |  |  |  |  |  | 0
Tax Expense |  |  |  |  |  |  |  |  |  |  |  |  | (10)
Total Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  | 34
Balance September 30, 2020, Net of Tax | 34 |  |  |  |  |  |  |  |  |  |  |  | 34
Other |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Balance December 31, 2019, Net of Tax |  |  |  |  | (56) |  |  |  |  |  |  |  | (56)
Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |
Income (Loss) Before Reclassifications |  |  |  |  |  |  |  |  |  |  |  |  | (9)
Amounts Reclassified to Net Earnings |  |  |  |  |  |  |  |  |  |  |  |  | 3
Tax Expense |  |  |  |  |  |  |  |  |  |  |  |  | 0
Total Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  | (6)
Balance September 30, 2020, Net of Tax | (62) |  |  |  |  |  |  |  |  |  |  |  | (62)
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Balance December 31, 2019, Net of Tax |  |  |  |  | (675) |  |  |  |  |  |  |  | (675)
Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |
Total Other Comprehensive Income (Loss) | 34 | [1] | $ 20 | [1] | $ 3 | [1] | $ 7 | [2] | $ 4 | [2] | $ 2 | [2] |
Balance September 30, 2020, Net of Tax | $ (618) |  |  |  |  |  |  |  |  |  |  |  | $ (618)
[1] | Accumulated Other Comprehensive Loss balances shown above are net of tax. The associated taxes were $183 million, $178 million and $165 million as of first, second and third quarters 2020, respectively. For additional information, see Note 11, Other Comprehensive Income.
[2] | Accumulated Other Comprehensive Loss balances shown above are net of tax. The associated taxes were $179 million, $177 million and $175 million as of first, second and third quarters 2019, respectively. For additional information, see Note 11, Other Comprehensive Income.

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