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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	$ (2,966)	$ (3,777)	$ (3,490)	$ (3,923)
Other comprehensive earnings (losses), net of deferred income taxes	(334)	238	56	300
Ending balance	(3,418)	(3,357)	(3,418)	(3,357)
Accumulated Other Comprehensive Losses [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(2,283)	(2,709)	(2,673)	(2,771)
Other comprehensive earnings (losses) before reclassifications	(425)	323	(184)	402
Deferred income taxes	92	(69)	38	(82)
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	(333)	254	(146)	320
Amounts reclassified to net earnings	(1)	(21)	253	(26)
Deferred income taxes	0	5	(51)	6
Amounts reclassified to net earnings, net of deferred income taxes	(1)	(16)	202	(20)
Other comprehensive earnings (losses), net of deferred income taxes	(334)	238	56	300
Ending balance	(2,617)	(2,471)	(2,617)	(2,471)
Benefit Plans [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(1,495)	(1,447)	(1,493)	(1,436)
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	(2)	(7)	(5)	(21)
Deferred income taxes	0	2	1	5
Amounts reclassified to net earnings, net of deferred income taxes	(2)	(5)	(4)	(16)
Other comprehensive earnings (losses), net of deferred income taxes	(2)	(5)	(4)	(16)
Ending balance	(1,497)	(1,452)	(1,497)	(1,452)
ABI [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(801)	(1,303)	(1,195)	(1,369)
Other comprehensive earnings (losses) before reclassifications	(423)	316	(180)	388
Deferred income taxes	92	(69)	38	(82)
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	(331)	247	(142)	306
Amounts reclassified to net earnings	1	(14)	258	(5)
Deferred income taxes	0	3	(52)	1
Amounts reclassified to net earnings, net of deferred income taxes	1	(11)	206	(4)
Other comprehensive earnings (losses), net of deferred income taxes	(330)	236	64	302
Ending balance	(1,131)	(1,067)	(1,131)	(1,067)
Currency Translation Adjustments and Other [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	13	41	15	34
Other comprehensive earnings (losses) before reclassifications	(2)	7	(4)	14
Deferred income taxes	0	0	0	0
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	(2)	7	(4)	14
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	(2)	7	(4)	14
Ending balance	$ 11	$ 48	$ 11	$ 48