Other Comprehensive Earnings/Losses (Changes in Each Component of Accumulated Other Comprehensive Losses) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	$ (3,490)	$ (3,923)
Other comprehensive earnings (losses), net of deferred income taxes	407	(8)
Ending balance	(5,064)	(3,826)
Accumulated Other Comprehensive Losses [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(2,673)	(2,771)
Other comprehensive earnings (losses) before reclassifications	260	(8)
Deferred income taxes	(55)	5
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	205	(3)
Amounts reclassified to net earnings	253	(7)
Deferred income taxes	(51)	2
Amounts reclassified to net earnings, net of deferred income taxes	202	(5)
Other comprehensive earnings (losses), net of deferred income taxes	407	(8)
Ending balance	(2,266)	(2,779)
Benefit Plans [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(1,493)	(1,436)
Other comprehensive earnings (losses) before reclassifications	0	0
Deferred income taxes	0	0
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	0	0
Amounts reclassified to net earnings	(2)	(8)
Deferred income taxes	1	2
Amounts reclassified to net earnings, net of deferred income taxes	(1)	(6)
Other comprehensive earnings (losses), net of deferred income taxes	(1)	(6)
Ending balance	(1,494)	(1,442)
ABI [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(1,195)	(1,369)
Other comprehensive earnings (losses) before reclassifications	254	(18)
Deferred income taxes	(55)	5
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	199	(13)
Amounts reclassified to net earnings	255	1
Deferred income taxes	(52)	0
Amounts reclassified to net earnings, net of deferred income taxes	203	1
Other comprehensive earnings (losses), net of deferred income taxes	402	(12)
Ending balance	(793)	(1,381)
Currency Translation Adjustments and Other [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	15	34
Other comprehensive earnings (losses) before reclassifications	6	10
Deferred income taxes	0	0
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	6	10
Amounts reclassified to net earnings	0	0
Deferred income taxes	0	0
Amounts reclassified to net earnings, net of deferred income taxes	0	0
Other comprehensive earnings (losses), net of deferred income taxes	6	10
Ending balance	$ 21	$ 44