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, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	$ (3,777)	$ (2,403)	$ (3,923)	$ (1,606)
Other comprehensive earnings (losses), net of deferred income taxes	238	(6)	300	673
Ending balance	(3,357)	(4,232)	(3,357)	(4,232)
Accumulated Other Comprehensive Losses [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(2,709)	(2,377)	(2,771)	(3,056)
Other comprehensive earnings (losses) before reclassifications	323	2	402	891
Deferred income taxes	(69)	(11)	(82)	(206)
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	254	(9)	320	685
Amounts reclassified to net earnings	(21)	7	(26)	(10)
Deferred income taxes	5	(4)	6	(2)
Amounts reclassified to net earnings, net of deferred income taxes	(16)	3	(20)	(12)
Other comprehensive earnings (losses), net of deferred income taxes	238	(6)	300	673
Ending balance	(2,471)	(2,383)	(2,471)	(2,383)
Benefit Plans [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(1,447)	(1,581)	(1,436)	(1,612)
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	(7)	24	(21)	65
Deferred income taxes	2	(7)	5	(17)
Amounts reclassified to net earnings, net of deferred income taxes	(5)	17	(16)	48
Other comprehensive earnings (losses), net of deferred income taxes	(5)	17	(16)	48
Ending balance	(1,452)	(1,564)	(1,452)	(1,564)
ABI [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(1,303)	(869)	(1,369)	(1,512)
Other comprehensive earnings (losses) before reclassifications	316	18	388	902
Deferred income taxes	(69)	(11)	(82)	(206)
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	247	7	306	696
Amounts reclassified to net earnings	(14)	(16)	(5)	(74)
Deferred income taxes	3	3	1	15
Amounts reclassified to net earnings, net of deferred income taxes	(11)	(13)	(4)	(59)
Other comprehensive earnings (losses), net of deferred income taxes	236	(6)	302	637
Ending balance	(1,067)	(875)	(1,067)	(875)
Currency Translation Adjustments and Other [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	41	73	34	68
Other comprehensive earnings (losses) before reclassifications	7	(16)	14	(11)
Deferred income taxes	0	0	0	0
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	7	(16)	14	(11)
Amounts reclassified to net earnings	0	(1)	0	(1)
Deferred income taxes	0	0	0	0
Amounts reclassified to net earnings, net of deferred income taxes	0	(1)	0	(1)
Other comprehensive earnings (losses), net of deferred income taxes	7	(17)	14	(12)
Ending balance	$ 48	$ 56	$ 48	$ 56