Other Comprehensive Income (Loss) - Schedule of Changes in AOCI Balance by Components (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		$ 12,507	$ 11,985	$ 12,469
Other Comprehensive Income (Loss)
Ending balance		13,160	12,507	11,985
Accumulated Other Comprehensive (Loss) Income
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	[1]	(232)	(279)	(410)
Other Comprehensive Income (Loss)
Income (Loss) Before Reclassifications		(3)	48	162
Amounts Reclassified to Net Earnings		25	12	23
Tax (Expense) Benefit		(3)	(13)	(54)
Total Other Comprehensive Income (Loss)		19	47	131
Ending balance	[1]	(213)	(232)	(279)
Pension and Other Post-Employment Benefits
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(349)	(390)	(519)
Other Comprehensive Income (Loss)
Income (Loss) Before Reclassifications		(3)	44	146
Amounts Reclassified to Net Earnings		16	10	18
Tax (Expense) Benefit		(1)	(13)	(35)
Total Other Comprehensive Income (Loss)		12	41	129
Ending balance		(337)	(349)	(390)
Interest Rate Derivatives
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		153	150	150
Other Comprehensive Income (Loss)
Income (Loss) Before Reclassifications		0	4	16
Amounts Reclassified to Net Earnings		0	0	0
Tax (Expense) Benefit		(1)	(1)	(16)
Total Other Comprehensive Income (Loss)		(1)	3	0
Ending balance		152	153	150
Other
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(36)	(39)	(41)
Other Comprehensive Income (Loss)
Income (Loss) Before Reclassifications		0	0	0
Amounts Reclassified to Net Earnings		9	2	5
Tax (Expense) Benefit		(1)	1	(3)
Total Other Comprehensive Income (Loss)		8	3	2
Ending balance		$ (28)	$ (36)	$ (39)

[1] Accumulated Other Comprehensive Loss year-end balances shown above are net of tax. The associated tax benefits were $58 million, $61 million, and $74 million for 2025, 2024 and 2023, respectively. For additional information see Note 16, Other Comprehensive Income (Loss).