Other Comprehensive Income (Loss) - Changes in AOCI Balance by Component (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Other Comprehensive Income (Loss)
Income Before Reclassifications		$ 3
Amounts Reclassified to Net Earnings		5
Tax Expense		(2)
Total Other Comprehensive Income		6	$ 2
Pension and Other Post-Employment Benefits
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance December 31, 2023, Net of Tax		(423)
Other Comprehensive Income (Loss)
Income Before Reclassifications		0
Amounts Reclassified to Net Earnings		3
Tax Expense		(1)
Total Other Comprehensive Income		2
Balance March 31, 2024, Net of Tax		(421)
Interest Rate Derivatives
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance December 31, 2023, Net of Tax		150
Other Comprehensive Income (Loss)
Income Before Reclassifications		3
Amounts Reclassified to Net Earnings		0
Tax Expense		(1)
Total Other Comprehensive Income		2
Balance March 31, 2024, Net of Tax		152
Other
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance December 31, 2023, Net of Tax		(39)
Other Comprehensive Income (Loss)
Income Before Reclassifications		0
Amounts Reclassified to Net Earnings		2
Tax Expense		0
Total Other Comprehensive Income		2
Balance March 31, 2024, Net of Tax		(37)
Accumulated Other Comprehensive (Loss) Income
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance December 31, 2023, Net of Tax		(312)
Other Comprehensive Income (Loss)
Total Other Comprehensive Income	[1]	6	$ 2
Balance March 31, 2024, Net of Tax		$ (306)

[1] (a) Accumulated Other Comprehensive Loss balances shown above are net of tax. The associated taxes were $82 million and $121 million as of March 31, 2024 and March 31, 2023, respectively. For additional information, see Note 10, Other Comprehensive Income.