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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, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019
Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |
Loss Before Reclassifications |  |  |  |  |  |  |  | $ (5)
Amounts Reclassified to Net Earnings |  |  |  |  |  |  |  | 24
Tax Expense |  |  |  |  |  |  |  | (6)
Total Other Comprehensive Income (Loss) |  | $ 7 | $ 4 | $ 2 | $ 7 | $ 4 | $ (99) | 13
Pension and Other Post-Employment Benefits |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Balance December 31, 2018, Net of Tax |  |  |  | (604) |  |  |  | (604)
Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |
Loss Before Reclassifications |  |  |  |  |  |  |  | 0
Amounts Reclassified to Net Earnings |  |  |  |  |  |  |  | 18
Tax Expense |  |  |  |  |  |  |  | (4)
Total Other Comprehensive Income (Loss) |  |  |  |  |  |  |  | 14
Balance September 30, 2019, Net of Tax |  | (590) |  |  |  |  |  | (590)
Other |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Balance December 31, 2018, Net of Tax |  |  |  | (57) |  |  |  | (57)
Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |
Loss Before Reclassifications |  |  |  |  |  |  |  | (5)
Amounts Reclassified to Net Earnings |  |  |  |  |  |  |  | 6
Tax Expense |  |  |  |  |  |  |  | (2)
Total Other Comprehensive Income (Loss) |  |  |  |  |  |  |  | (1)
Balance September 30, 2019, Net of Tax |  | (58) |  |  |  |  |  | (58)
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Balance December 31, 2018, Net of Tax |  |  |  | (661) |  |  |  | (661)
Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |
Total Other Comprehensive Income (Loss) | [1] | 7 | $ 4 | $ 2 | $ 7 | $ 4 | $ (99) |
Balance September 30, 2019, Net of Tax |  | $ (648) |  |  |  |  |  | $ (648)
[1] | Accumulated Other Comprehensive Loss balances shown above are net of tax. The associated taxes were $160 million, $158 million, and $156 million as of first, second and third quarters 2018, respectively. For additional information, see Note 12, Other Comprehensive Income.

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