Other Comprehensive Earnings/Losses (Changes in Each Component of Accumulated Other Comprehensive Losses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	$ (1,606)	$ 2,925	$ 6,319
Other comprehensive earnings (losses), net of deferred income taxes	285	1,285	(1,477)
Ending balances	(3,923)	(1,606)	2,925
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(3,056)	(4,341)	(2,864)
Other comprehensive earnings (losses) before reclassifications	387	1,613	(2,071)
Deferred income taxes	(100)	(386)	467
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	287	1,227	(1,604)
Amounts reclassified to net earnings	2	81	169
Deferred income taxes	(4)	(23)	(42)
Amounts reclassified to net earnings, net of deferred income taxes	(2)	58	127
Other comprehensive earnings (losses), net of deferred income taxes	285	1,285	(1,477)
Ending balances	(2,771)	(3,056)	(4,341)
Benefit Plans [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(1,612)	(2,420)	(2,192)
Other comprehensive earnings (losses) before reclassifications	145	961	(454)
Deferred income taxes	(35)	(245)	115
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	110	716	(339)
Amounts reclassified to net earnings	88	122	148
Deferred income taxes	(22)	(30)	(37)
Amounts reclassified to net earnings, net of deferred income taxes	66	92	111
Other comprehensive earnings (losses), net of deferred income taxes	176	808	(228)
Ending balances	(1,436)	(1,612)	(2,420)
ABI [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(1,512)	(1,938)	(693)
Other comprehensive earnings (losses) before reclassifications	275	627	(1,613)
Deferred income taxes	(65)	(141)	352
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	210	486	(1,261)
Amounts reclassified to net earnings	(85)	(76)	21
Deferred income taxes	18	16	(5)
Amounts reclassified to net earnings, net of deferred income taxes	(67)	(60)	16
Other comprehensive earnings (losses), net of deferred income taxes	143	426	(1,245)
Ending balances	(1,369)	(1,512)	(1,938)
Currency Translation Adjustments and Other [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	68	17	21
Other comprehensive earnings (losses) before reclassifications	(33)	25	(4)
Deferred income taxes	0	0	0
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	(33)	25	(4)
Amounts reclassified to net earnings	(1)	35	0
Deferred income taxes	0	(9)	0
Amounts reclassified to net earnings, net of deferred income taxes	(1)	26	0
Other comprehensive earnings (losses), net of deferred income taxes	(34)	51	(4)
Ending balances	$ 34	$ 68	$ 17