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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	$ (1,760)	$ 2,995	$ (1,606)	$ 2,925
Other comprehensive earnings (losses), net of deferred income taxes	585	172	679	739
Ending balance	(2,403)	3,259	(2,403)	3,259
Accumulated Other Comprehensive Losses [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(2,962)	(3,774)	(3,056)	(4,341)
Other comprehensive earnings (losses) before reclassifications	750	219	889	931
Deferred income taxes	(163)	(61)	(195)	(212)
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	587	158	694	719
Amounts reclassified to net earnings	(3)	19	(17)	29
Deferred income taxes	1	(5)	2	(9)
Amounts reclassified to net earnings, net of deferred income taxes	(2)	14	(15)	20
Other comprehensive earnings (losses), net of deferred income taxes	585	172	679	739
Ending balance	(2,377)	(3,602)	(2,377)	(3,602)
Benefit Plans [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(1,597)	(2,392)	(1,612)	(2,420)
Other comprehensive earnings (losses) before reclassifications	0	432	0	432
Deferred income taxes	0	(109)	0	(109)
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	0	323	0	323
Amounts reclassified to net earnings	20	34	41	72
Deferred income taxes	(4)	(8)	(10)	(18)
Amounts reclassified to net earnings, net of deferred income taxes	16	26	31	54
Other comprehensive earnings (losses), net of deferred income taxes	16	349	31	377
Ending balance	(1,581)	(2,043)	(1,581)	(2,043)
ABI [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(1,434)	(1,421)	(1,512)	(1,938)
Other comprehensive earnings (losses) before reclassifications	746	(220)	884	470
Deferred income taxes	(163)	48	(195)	(103)
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	583	(172)	689	367
Amounts reclassified to net earnings	(23)	(14)	(58)	(42)
Deferred income taxes	5	3	12	9
Amounts reclassified to net earnings, net of deferred income taxes	(18)	(11)	(46)	(33)
Other comprehensive earnings (losses), net of deferred income taxes	565	(183)	643	334
Ending balance	(869)	(1,604)	(869)	(1,604)
Currency Translation Adjustments and Other [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	69	39	68	17
Other comprehensive earnings (losses) before reclassifications	4	7	5	29
Deferred income taxes	0	0	0	0
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	4	7	5	29
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	4	6	5	28
Ending balance	$ 73	$ 45	$ 73	$ 45