Other Comprehensive Earnings/Losses (Changes in Each Component of Accumulated Other Comprehensive Losses) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	$ (5,064)	$ (3,826)	$ (3,490)	$ (3,923)
Other comprehensive earnings (losses), net of deferred income taxes	(17)	70	390	62
Ending balance	(2,966)	(3,777)	(2,966)	(3,777)
Accumulated Other Comprehensive Losses [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(2,266)	(2,779)	(2,673)	(2,771)
Other comprehensive earnings (losses) before reclassifications	(19)	87	241	79
Deferred income taxes	1	(18)	(54)	(13)
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	(18)	69	187	66
Amounts reclassified to net earnings	1	2	254	(5)
Deferred income taxes	0	(1)	(51)	1
Amounts reclassified to net earnings, net of deferred income taxes	1	1	203	(4)
Other comprehensive earnings (losses), net of deferred income taxes	(17)	70	390	62
Ending balance	(2,283)	(2,709)	(2,283)	(2,709)
Benefit Plans [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(1,494)	(1,442)	(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	(1)	(6)	(3)	(14)
Deferred income taxes	0	1	1	3
Amounts reclassified to net earnings, net of deferred income taxes	(1)	(5)	(2)	(11)
Other comprehensive earnings (losses), net of deferred income taxes	(1)	(5)	(2)	(11)
Ending balance	(1,495)	(1,447)	(1,495)	(1,447)
ABI [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(793)	(1,381)	(1,195)	(1,369)
Other comprehensive earnings (losses) before reclassifications	(11)	90	243	72
Deferred income taxes	1	(18)	(54)	(13)
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	(10)	72	189	59
Amounts reclassified to net earnings	2	8	257	9
Deferred income taxes	0	(2)	(52)	(2)
Amounts reclassified to net earnings, net of deferred income taxes	2	6	205	7
Other comprehensive earnings (losses), net of deferred income taxes	(8)	78	394	66
Ending balance	(801)	(1,303)	(801)	(1,303)
Currency Translation Adjustments and Other [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	21	44	15	34
Other comprehensive earnings (losses) before reclassifications	(8)	(3)	(2)	7
Deferred income taxes	0	0	0	0
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	(8)	(3)	(2)	7
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	(8)	(3)	(2)	7
Ending balance	$ 13	$ 41	$ 13	$ 41