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Other Comprehensive Income (Loss) - Changes in AOCI balance by Component (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Other Comprehensive Income (Loss) |  |  |
Loss Before Reclassifications |  | $ (2) |
Amounts Reclassified to Net Earnings |  | 6 |
Tax Expense |  | (2) |
Total Other Comprehensive Income (Loss) |  | 2 | $ (99)
Pension and Other Post-Employment Benefits |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance |  | (604) |
Other Comprehensive Income (Loss) |  |  |
Loss Before Reclassifications |  | 0 |
Amounts Reclassified to Net Earnings |  | 6 |
Tax Expense |  | (1) |
Total Other Comprehensive Income (Loss) |  | 5 |
Ending balance |  | (599) |
Other |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance |  | (57) |
Other Comprehensive Income (Loss) |  |  |
Loss Before Reclassifications |  | (2) |
Amounts Reclassified to Net Earnings |  | 0 |
Tax Expense |  | (1) |
Total Other Comprehensive Income (Loss) |  | (3) |
Ending balance |  | (60) |
Accumulated Other Comprehensive Income (Loss) |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance |  | (661) |
Other Comprehensive Income (Loss) |  |  |
Total Other Comprehensive Income (Loss) | [1] | 2 | $ (99)
Ending balance |  | $ (659) |
[1] | Accumulated Other Comprehensive Loss balances shown above are net of tax. The associated taxes were $179 million and $160 million as of March 31, 2019 and March 31, 2018, respectively. For additional information, see Note 12, Other Comprehensive Income.

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- Definition Amount before tax and reclassification adjustments of other comprehensive income (loss) attributable to parent. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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