Other Comprehensive Earnings/Losses (Changes in Each Component of Accumulated Other Comprehensive Losses) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	$ (2,403)	$ 3,259	$ (1,606)	$ 2,925
Other comprehensive earnings (losses), net of deferred income taxes	(6)	172	673	911
Ending balance	(4,232)	(1,265)	(4,232)	(1,265)
Accumulated Other Comprehensive Losses [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(2,377)	(3,602)	(3,056)	(4,341)
Other comprehensive earnings (losses) before reclassifications	2	221	891	1,152
Deferred income taxes	(11)	(57)	(206)	(269)
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	(9)	164	685	883
Amounts reclassified to net earnings (losses)	7	12	(10)	41
Deferred income taxes	(4)	(4)	(2)	(13)
Amounts reclassified to net earnings (losses), net of deferred income taxes	3	8	(12)	28
Other comprehensive earnings (losses), net of deferred income taxes	(6)	172	673	911
Ending balance	(2,383)	(3,430)	(2,383)	(3,430)
Benefit Plans [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(1,581)	(2,043)	(1,612)	(2,420)
Other comprehensive earnings (losses) before reclassifications	0	0	0	432
Deferred income taxes	0	(9)	0	(118)
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	0	(9)	0	314
Amounts reclassified to net earnings (losses)	24	20	65	92
Deferred income taxes	(7)	(5)	(17)	(23)
Amounts reclassified to net earnings (losses), net of deferred income taxes	17	15	48	69
Other comprehensive earnings (losses), net of deferred income taxes	17	6	48	383
Ending balance	(1,564)	(2,037)	(1,564)	(2,037)
ABI [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(869)	(1,604)	(1,512)	(1,938)
Other comprehensive earnings (losses) before reclassifications	18	215	902	685
Deferred income taxes	(11)	(48)	(206)	(151)
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	7	167	696	534
Amounts reclassified to net earnings (losses)	(16)	(7)	(74)	(49)
Deferred income taxes	3	1	15	10
Amounts reclassified to net earnings (losses), net of deferred income taxes	(13)	(6)	(59)	(39)
Other comprehensive earnings (losses), net of deferred income taxes	(6)	161	637	495
Ending balance	(875)	(1,443)	(875)	(1,443)
Currency Translation Adjustments and Other [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	73	45	68	17
Other comprehensive earnings (losses) before reclassifications	(16)	6	(11)	35
Deferred income taxes	0	0	0	0
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	(16)	6	(11)	35
Amounts reclassified to net earnings (losses)	(1)	(1)	(1)	(2)
Deferred income taxes	0	0	0	0
Amounts reclassified to net earnings (losses), net of deferred income taxes	(1)	(1)	(1)	(2)
Other comprehensive earnings (losses), net of deferred income taxes	(17)	5	(12)	33
Ending balance	$ 56	$ 50	$ 56	$ 50