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, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	$ (3,826)	$ (1,760)	$ (3,923)	$ (1,606)
Other comprehensive earnings (losses), net of deferred income taxes	70	585	62	679
Ending balance	(3,777)	(2,403)	(3,777)	(2,403)
Accumulated Other Comprehensive Losses [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(2,779)	(2,962)	(2,771)	(3,056)
Other comprehensive earnings (losses) before reclassifications	87	750	79	889
Deferred income taxes	(18)	(163)	(13)	(195)
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	69	587	66	694
Amounts reclassified to net earnings	2	(3)	(5)	(17)
Deferred income taxes	(1)	1	1	2
Amounts reclassified to net earnings, net of deferred income taxes	1	(2)	(4)	(15)
Other comprehensive earnings (losses), net of deferred income taxes	70	585	62	679
Ending balance	(2,709)	(2,377)	(2,709)	(2,377)
Benefit Plans [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(1,442)	(1,597)	(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	(6)	20	(14)	41
Deferred income taxes	1	(4)	3	(10)
Amounts reclassified to net earnings, net of deferred income taxes	(5)	16	(11)	31
Other comprehensive earnings (losses), net of deferred income taxes	(5)	16	(11)	31
Ending balance	(1,447)	(1,581)	(1,447)	(1,581)
ABI [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(1,381)	(1,434)	(1,369)	(1,512)
Other comprehensive earnings (losses) before reclassifications	90	746	72	884
Deferred income taxes	(18)	(163)	(13)	(195)
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	72	583	59	689
Amounts reclassified to net earnings	8	(23)	9	(58)
Deferred income taxes	(2)	5	(2)	12
Amounts reclassified to net earnings, net of deferred income taxes	6	(18)	7	(46)
Other comprehensive earnings (losses), net of deferred income taxes	78	565	66	643
Ending balance	(1,303)	(869)	(1,303)	(869)
Currency Translation Adjustments and Other [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	44	69	34	68
Other comprehensive earnings (losses) before reclassifications	(3)	4	7	5
Deferred income taxes	0	0	0	0
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	(3)	4	7	5
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	(3)	4	7	5
Ending balance	$ 41	$ 73	$ 41	$ 73