Other Comprehensive Earnings/Losses (Changes in Each Component of Accumulated Other Comprehensive Losses) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	$ (1,606)	$ 2,925
Other comprehensive earnings (losses), net of deferred income taxes	94	567
Ending balance	(1,760)	2,995
Accumulated Other Comprehensive Losses [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(3,056)	(4,341)
Other comprehensive earnings (losses) before reclassifications	139	712
Deferred income taxes	(32)	(151)
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	107	561
Amounts reclassified to net earnings	(14)	10
Deferred income taxes	1	(4)
Amounts reclassified to net earnings, net of deferred income taxes	(13)	6
Other comprehensive earnings (losses), net of deferred income taxes	94	567
Ending balance	(2,962)	(3,774)
Benefit Plans [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(1,612)	(2,420)
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	21	38
Deferred income taxes	(6)	(10)
Amounts reclassified to net earnings, net of deferred income taxes	15	28
Other comprehensive earnings (losses), net of deferred income taxes	15	28
Ending balance	(1,597)	(2,392)
ABI [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(1,512)	(1,938)
Other comprehensive earnings (losses) before reclassifications	138	690
Deferred income taxes	(32)	(151)
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	106	539
Amounts reclassified to net earnings	(35)	(28)
Deferred income taxes	7	6
Amounts reclassified to net earnings, net of deferred income taxes	(28)	(22)
Other comprehensive earnings (losses), net of deferred income taxes	78	517
Ending balance	(1,434)	(1,421)
Currency Translation Adjustments and Other [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	68	17
Other comprehensive earnings (losses) before reclassifications	1	22
Deferred income taxes	0	0
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	1	22
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	1	22
Ending balance	$ 69	$ 39