Other Comprehensive Earnings/Losses (Changes in Each Component of Accumulated Other Comprehensive Losses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	$ (3,923)	$ (1,606)	$ 2,925
Other comprehensive earnings (losses), net of deferred income taxes	98	285	1,285
Ending balances	(3,490)	(3,923)	(1,606)
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(2,771)	(3,056)	(4,341)
Other comprehensive earnings (losses) before reclassifications	102	387	1,613
Deferred income taxes	(17)	(100)	(386)
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	85	287	1,227
Amounts reclassified to net earnings	13	2	81
Deferred income taxes	0	(4)	(23)
Amounts reclassified to net earnings, net of deferred income taxes	13	(2)	58
Other comprehensive earnings (losses), net of deferred income taxes	98	285	1,285
Ending balances	(2,673)	(2,771)	(3,056)
Benefit Plans [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(1,436)	(1,612)	(2,420)
Other comprehensive earnings (losses) before reclassifications	(48)	145	961
Deferred income taxes	9	(35)	(245)
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	(39)	110	716
Amounts reclassified to net earnings	(26)	88	122
Deferred income taxes	8	(22)	(30)
Amounts reclassified to net earnings, net of deferred income taxes	(18)	66	92
Other comprehensive earnings (losses), net of deferred income taxes	(57)	176	808
Ending balances	(1,493)	(1,436)	(1,612)
ABI [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(1,369)	(1,512)	(1,938)
Other comprehensive earnings (losses) before reclassifications	178	275	627
Deferred income taxes	(35)	(65)	(141)
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	143	210	486
Amounts reclassified to net earnings	39	(85)	(76)
Deferred income taxes	(8)	18	16
Amounts reclassified to net earnings, net of deferred income taxes	31	(67)	(60)
Other comprehensive earnings (losses), net of deferred income taxes	174	143	426
Ending balances	(1,195)	(1,369)	(1,512)
Currency Translation Adjustments and Other [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	34	68	17
Other comprehensive earnings (losses) before reclassifications	(28)	(33)	25
Deferred income taxes	9	0	0
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	(19)	(33)	25
Amounts reclassified to net earnings	0	(1)	35
Deferred income taxes	0	0	(9)
Amounts reclassified to net earnings, net of deferred income taxes	0	(1)	26
Other comprehensive earnings (losses), net of deferred income taxes	(19)	(34)	51
Ending balances	$ 15	$ 34	$ 68