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Other Comprehensive Income (Loss) - Changes in AOCI Balance by Component (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Other Comprehensive Income (Loss) |  |  |
Income Before Reclassifications |  | $ 73 |
Amounts Reclassified to Net Earnings |  | 14 |
Tax (Expense) Benefit |  | (19) |
Total Other Comprehensive Income (Loss) |  | 68 | $ 3
Pension and Other Post-Employment Benefits |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance December 31, 2020, Net of Tax |  | (598) |
Other Comprehensive Income (Loss) |  |  |
Income Before Reclassifications |  | 0 |
Amounts Reclassified to Net Earnings |  | 17 |
Tax (Expense) Benefit |  | (3) |
Total Other Comprehensive Income (Loss) |  | 14 |
Balance March 31, 2021, Net of Tax |  | (584) |
Interest Rate Derivatives |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance December 31, 2020, Net of Tax |  | 62 |
Other Comprehensive Income (Loss) |  |  |
Income Before Reclassifications |  | 73 |
Amounts Reclassified to Net Earnings |  | 0 |
Tax (Expense) Benefit |  | (17) |
Total Other Comprehensive Income (Loss) |  | 56 |
Balance March 31, 2021, Net of Tax |  | 118 |
Other |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance December 31, 2020, Net of Tax |  | (62) |
Other Comprehensive Income (Loss) |  |  |
Income Before Reclassifications |  | 0 |
Amounts Reclassified to Net Earnings |  | (3) |
Tax (Expense) Benefit |  | 1 |
Total Other Comprehensive Income (Loss) |  | (2) |
Balance March 31, 2021, Net of Tax |  | (64) |
Accumulated Other Comprehensive Income (Loss) |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balance December 31, 2020, Net of Tax |  | (598) |
Other Comprehensive Income (Loss) |  |  |
Total Other Comprehensive Income (Loss) | [1] | 68 | $ 3
Balance March 31, 2021, Net of Tax |  | $ (530) |
[1] | Accumulated Other Comprehensive Loss balances shown above are net of tax. The associated taxes were $137 million and $183 million as of March 31, 2021 and March 31, 2020, respectively. For additional information, see Note 11, Other Comprehensive Income.

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