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Other Comprehensive Income / (Loss) - Changes in AOCI Balance by Components (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Other Comprehensive Income (Loss): |  |  |  |
Effects |  |  |  | $ (107)
(Loss) Income Before Reclassifications |  | $ 53 | $ (48) | (119)
Amounts Reclassified to Net Earnings |  | 52 | 31 | 32
Tax Benefit (Expense) |  | (28) | 3 | 19
Total Other Comprehensive Income (Loss) (Note 16) |  | 77 | (14) | (175)
Pension and Other Post-Employment Benefits |  |  |  |
Other Comprehensive Income (Loss): |  |  |  |
Beginning Balance |  | (619) | (604) | (440)
Effects |  |  |  | (108)
(Loss) Income Before Reclassifications |  | (17) | (43) | (111)
Amounts Reclassified to Net Earnings |  | 47 | 23 | 38
Tax Benefit (Expense) |  | (9) | 5 | 17
Total Other Comprehensive Income (Loss) (Note 16) |  | 21 | (15) | (164)
Ending Balance |  | (598) | (619) | (604)
Interest Rate Derivatives |  |  |  |
Other Comprehensive Income (Loss): |  |  |  |
Beginning Balance |  | 0 | 0 | 0
Effects |  |  |  | 0
(Loss) Income Before Reclassifications |  | 80 | 0 | 0
Amounts Reclassified to Net Earnings |  | 0 | 0 | 0
Tax Benefit (Expense) |  | (18) | 0 | 0
Total Other Comprehensive Income (Loss) (Note 16) |  | 62 | 0 | 0
Ending Balance |  | 62 | 0 | 0
Other |  |  |  |
Other Comprehensive Income (Loss): |  |  |  |
Beginning Balance |  | (56) | (57) | (46)
Effects |  |  |  | 1
(Loss) Income Before Reclassifications |  | (10) | (5) | (8)
Amounts Reclassified to Net Earnings |  | 5 | 8 | (6)
Tax Benefit (Expense) |  | (1) | (2) | 2
Total Other Comprehensive Income (Loss) (Note 16) |  | (6) | 1 | (11)
Ending Balance |  | (62) | (56) | (57)
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Other Comprehensive Income (Loss): |  |  |  |
Beginning Balance |  | (675) | (661) | (486)
Total Other Comprehensive Income (Loss) (Note 16) | [1] | 77 | (14) | (175)
Ending Balance |  | $ (598) | $ (675) | $ (661)
[1] | Accumulated Other Comprehensive Loss year-end balances shown above are net of tax. The associated taxes were $156 million, $184 million and $180 million for 2020, 2019 and 2018, respectively. For additional information see Note 16, Other Comprehensive Income.

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