Other Comprehensive Earnings/Losses (Changes in Each Component of Accumulated Other Comprehensive Losses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	$ 2,925	$ 6,319	$ 14,789
Other comprehensive earnings (losses), net of deferred income taxes	1,285	(1,477)	(317)
Ending balances	(1,606)	2,925	6,319
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(4,341)	(2,864)	(2,547)
Other comprehensive earnings (losses) before reclassifications	1,613	(2,071)	(545)
Deferred income taxes	(386)	467	126
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	1,227	(1,604)	(419)
Amounts reclassified to net earnings (losses)	81	169	139
Deferred income taxes	(23)	(42)	(37)
Amounts reclassified to net earnings (losses), net of deferred income taxes	58	127	102
Other comprehensive earnings (losses), net of deferred income taxes	1,285	(1,477)	(317)
Ending balances	(3,056)	(4,341)	(2,864)
Benefit Plans [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(2,420)	(2,192)	(2,168)
Other comprehensive earnings (losses) before reclassifications	961	(454)	(204)
Deferred income taxes	(245)	115	51
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	716	(339)	(153)
Amounts reclassified to net earnings (losses)	122	148	173
Deferred income taxes	(30)	(37)	(44)
Amounts reclassified to net earnings (losses), net of deferred income taxes	92	111	129
Other comprehensive earnings (losses), net of deferred income taxes	808	(228)	(24)
Ending balances	(1,612)	(2,420)	(2,192)
ABI [Member] | ABI [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(1,938)	(693)	(374)
Other comprehensive earnings (losses) before reclassifications	627	(1,613)	(367)
Deferred income taxes	(141)	352	75
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	486	(1,261)	(292)
Amounts reclassified to net earnings (losses)	(76)	21	(34)
Deferred income taxes	16	(5)	7
Amounts reclassified to net earnings (losses), net of deferred income taxes	(60)	16	(27)
Other comprehensive earnings (losses), net of deferred income taxes	426	(1,245)	(319)
Ending balances	(1,512)	(1,938)	(693)
Currency Translation Adjustments and Other [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	17	21	(5)
Other comprehensive earnings (losses) before reclassifications	25	(4)	26
Deferred income taxes	0	0	0
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	25	(4)	26
Amounts reclassified to net earnings (losses)	35	0	0
Deferred income taxes	(9)	0	0
Amounts reclassified to net earnings (losses), net of deferred income taxes	26	0	0
Other comprehensive earnings (losses), net of deferred income taxes	51	(4)	26
Ending balances	$ 68	$ 17	$ 21