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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, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Other Comprehensive Income (Loss)              
Income Before Reclassifications             $ 36
Amounts Reclassified to Net Earnings             48
Tax Expense             (20)
Total Other Comprehensive Income $ 17 $ (21) $ 68 $ 34 $ 20 $ 3 64
Pension and Other Post-Employment Benefits              
AOCI Attributable to Parent, Net of Tax [Roll Forward]              
Balance December 31, 2020, Net of Tax     (598)       (598)
Other Comprehensive Income (Loss)              
Income Before Reclassifications             0
Amounts Reclassified to Net Earnings             50
Tax Expense             (12)
Total Other Comprehensive Income             38
Balance September 30, 2021, Net of Tax (560)           (560)
Interest Rate Derivatives              
AOCI Attributable to Parent, Net of Tax [Roll Forward]              
Balance December 31, 2020, Net of Tax     62       62
Other Comprehensive Income (Loss)              
Income Before Reclassifications             36
Amounts Reclassified to Net Earnings             0
Tax Expense             (8)
Total Other Comprehensive Income             28
Balance September 30, 2021, Net of Tax 90           90
Other              
AOCI Attributable to Parent, Net of Tax [Roll Forward]              
Balance December 31, 2020, Net of Tax     (62)       (62)
Other Comprehensive Income (Loss)              
Income Before Reclassifications             0
Amounts Reclassified to Net Earnings             (2)
Tax Expense             0
Total Other Comprehensive Income             (2)
Balance September 30, 2021, Net of Tax (64)           (64)
Accumulated Other Comprehensive Income (Loss)              
AOCI Attributable to Parent, Net of Tax [Roll Forward]              
Balance December 31, 2020, Net of Tax     (598)       (598)
Other Comprehensive Income (Loss)              
Total Other Comprehensive Income 17 [1] $ (21) [1] $ 68 [1] $ 34 [2] $ 20 [2] $ 3 [2]  
Balance September 30, 2021, Net of Tax $ (534)           $ (534)
[1] Accumulated Other Comprehensive Loss balances shown above are net of tax. The associated taxes were $137 million, $142 million, and $136 million as of first, second, and third quarters 2021, 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 $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.