Other Comprehensive Earnings/Losses (Changes in Each Component of Accumulated Other Comprehensive Losses) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	$ (3,206)	$ (2,966)	$ (2,188)	$ (3,490)
Other comprehensive earnings (losses), net of deferred income taxes	122	(334)	(309)	56
Ending balance	(2,596)	(3,418)	(2,596)	(3,418)
Accumulated Other Comprehensive Losses [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(2,831)	(2,283)	(2,400)	(2,673)
Other comprehensive earnings (losses) before reclassifications	150	(425)	(380)	(184)
Deferred income taxes	(27)	92	91	38
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	123	(333)	(289)	(146)
Amounts reclassified to net earnings	(2)	(1)	(26)	253
Deferred income taxes	1	0	6	(51)
Amounts reclassified to net earnings, net of deferred income taxes	(1)	(1)	(20)	202
Other comprehensive earnings (losses), net of deferred income taxes	122	(334)	(309)	56
Ending balance	(2,709)	(2,617)	(2,709)	(2,617)
Benefit Plans [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(1,389)	(1,495)	(1,392)	(1,493)
Other comprehensive earnings (losses) before reclassifications	0	0	0	0
Deferred income taxes	0	0	0	0
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	0	0	0	0
Amounts reclassified to net earnings	1	(2)	5	(5)
Deferred income taxes	0	0	(1)	1
Amounts reclassified to net earnings, net of deferred income taxes	1	(2)	4	(4)
Other comprehensive earnings (losses), net of deferred income taxes	1	(2)	4	(4)
Ending balance	(1,388)	(1,497)	(1,388)	(1,497)
ABI [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(1,432)	(801)	(1,018)	(1,195)
Other comprehensive earnings (losses) before reclassifications	126	(423)	(384)	(180)
Deferred income taxes	(27)	92	91	38
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	99	(331)	(293)	(142)
Amounts reclassified to net earnings	(3)	1	(31)	258
Deferred income taxes	1	0	7	(52)
Amounts reclassified to net earnings, net of deferred income taxes	(2)	1	(24)	206
Other comprehensive earnings (losses), net of deferred income taxes	97	(330)	(317)	64
Ending balance	(1,335)	(1,131)	(1,335)	(1,131)
Currency Translation Adjustments and Other [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(10)	13	10	15
Other comprehensive earnings (losses) before reclassifications	24	(2)	4	(4)
Deferred income taxes	0	0	0	0
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	24	(2)	4	(4)
Amounts reclassified to net earnings	0	0	0	0
Deferred income taxes	0	0	0	0
Amounts reclassified to net earnings, net of deferred income taxes	0	0	0	0
Other comprehensive earnings (losses), net of deferred income taxes	24	(2)	4	(4)
Ending balance	$ 14	$ 11	$ 14	$ 11