Other Comprehensive Income (Loss) - Changes in AOCI Balance by Components (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Other Comprehensive Income (Loss):
Income Before Reclassifications		$ 91	$ (41)	$ 158
Amounts Reclassified to Net Earnings		23	46	81
Tax Benefit (Expense)		(38)	15	(49)
Total Other Comprehensive Income (Note 16)		76	20	190
Pension and Other Post-Employment Benefits
Other Comprehensive Income (Loss):
Beginning Balance		(497)	(431)	(598)
Income Before Reclassifications		75	(129)	147
Amounts Reclassified to Net Earnings		18	44	66
Tax Benefit (Expense)		(19)	19	(46)
Total Other Comprehensive Income (Note 16)		74	(66)	167
Ending Balance		(423)	(497)	(431)
Interest Rate Derivatives
Other Comprehensive Income (Loss):
Beginning Balance		150	70	62
Income Before Reclassifications		16	88	11
Amounts Reclassified to Net Earnings		0	0	0
Tax Benefit (Expense)		(16)	(8)	(3)
Total Other Comprehensive Income (Note 16)		0	80	8
Ending Balance		150	150	70
Other
Other Comprehensive Income (Loss):
Beginning Balance		(41)	(47)	(62)
Income Before Reclassifications		0	0	0
Amounts Reclassified to Net Earnings		5	2	15
Tax Benefit (Expense)		(3)	4	0
Total Other Comprehensive Income (Note 16)		2	6	15
Ending Balance		(39)	(41)	(47)
Accumulated Other Comprehensive (Loss) Income
Other Comprehensive Income (Loss):
Beginning Balance		(388)	(408)	(598)
Total Other Comprehensive Income (Note 16)	[1]	76	20	190
Ending Balance		$ (312)	$ (388)	$ (408)

[1] Accumulated Other Comprehensive Loss year-end balances shown above are net of tax. The associated taxes were $84 million, $122 million, and $107 million for 2023, 2022 and 2021, respectively. For additional information see Note 16, Other Comprehensive Income (Loss).