Other Comprehensive Income (Loss) - Schedule of Changes in AOCI balance by Component (Details) - USD ($) $ in Millions	3 Months Ended												9 Months Ended	12 Months Ended
	Sep. 30, 2024		Jun. 30, 2024	[1]	Mar. 31, 2024		Sep. 30, 2023	[2]	Jun. 30, 2023	[2]	Mar. 31, 2023	[2]	Sep. 30, 2024	Dec. 31, 2023	Dec. 31, 2022
Other Comprehensive Income (Loss)
Income Before Reclassifications													$ 4
Amounts Reclassified to Net Earnings													9
Tax Expense													(3)
Total Other Comprehensive Income	$ 1	[1]	$ 3		$ 6	[1]	$ 18		$ (4)		$ 2		10	$ 131	$ (34)
Pension and Other Post-Employment Benefits
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance December 31, 2023, Net of Tax					(390)								(390)
Other Comprehensive Income (Loss)
Income Before Reclassifications													0
Amounts Reclassified to Net Earnings													8
Tax Expense													(2)
Total Other Comprehensive Income													6
Balance September 30, 2024, Net of Tax	(384)												(384)	(390)
Interest Rate Derivatives
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance December 31, 2023, Net of Tax					150								150
Other Comprehensive Income (Loss)
Income Before Reclassifications													4
Amounts Reclassified to Net Earnings													0
Tax Expense													(1)
Total Other Comprehensive Income													3
Balance September 30, 2024, Net of Tax	153												153	150
Other
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance December 31, 2023, Net of Tax					(39)								(39)
Other Comprehensive Income (Loss)
Income Before Reclassifications													0
Amounts Reclassified to Net Earnings													1
Tax Expense													0
Total Other Comprehensive Income													1
Balance September 30, 2024, Net of Tax	(38)												(38)	(39)
Accumulated Other Comprehensive (Loss) Income
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance December 31, 2023, Net of Tax					(279)								(279)
Other Comprehensive Income (Loss)
Total Other Comprehensive Income	1	[1],[3]	$ 3	[3]	$ 6	[1],[3]	$ 18	[4]	$ (4)	[4]	$ 2	[4]		131	$ (34)
Balance September 30, 2024, Net of Tax	$ (269)												$ (269)	$ (279)

[1] See Note 11, Revision of Prior Period Financial Statements.

[2] See Note 11, Revision of Prior Period Financial Statements.

[3] Accumulated Other Comprehensive Loss balances shown above are net of tax. The associated taxes were $74 million as of December 31, 2023, $72 million as of March 31, 2024, $72 million as of June 30, 2024 and $71 million as of September 30, 2024. For additional information, see Note 10, Other Comprehensive Income.

[4] Accumulated Other Comprehensive Loss balances shown above are net of tax. The associated taxes were $129 million as of December 31, 2022, $128 million as of March 31, 2023, $114 million as of June 30, 2023 and $108 million as of September 30, 2023. For additional information, see Note 10, Other Comprehensive Income.