Other Comprehensive Earnings/Losses (Changes in Each Component of Accumulated Other Comprehensive Losses) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	$ 6,637	$ 14,081	$ 6,319	$ 14,789
Other comprehensive earnings (losses), net of deferred income taxes	(1,241)	71	(910)	(99)
Ending balance	5,786	14,466	5,786	14,466
Accumulated Other Comprehensive Losses [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(2,533)	(2,717)	(2,864)	(2,547)
Other comprehensive earnings (losses) before reclassifications	(1,579)	69	(1,179)	(169)
Deferred income taxes	323	(12)	238	37
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	(1,256)	57	(941)	(132)
Amounts reclassified to net earnings	20	20	41	47
Deferred income taxes	(5)	(6)	(10)	(14)
Amounts reclassified to net earnings, net of deferred income taxes	15	14	31	33
Other comprehensive earnings (losses), net of deferred income taxes	(1,241)	71	(910)	(99)
Ending balance	(3,774)	(2,646)	(3,774)	(2,646)
Benefit Plans [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(2,171)	(2,139)	(2,192)	(2,168)
Other comprehensive earnings (losses) before reclassifications	0	0	0	0
Deferred income taxes	0	0	0	0
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	0	0	0	0
Amounts reclassified to net earnings	28	39	56	78
Deferred income taxes	(7)	(10)	(14)	(20)
Amounts reclassified to net earnings, net of deferred income taxes	21	29	42	58
Other comprehensive earnings (losses), net of deferred income taxes	21	29	42	58
Ending balance	(2,150)	(2,110)	(2,150)	(2,110)
ABI [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(395)	(573)	(693)	(374)
Other comprehensive earnings (losses) before reclassifications	(1,528)	56	(1,140)	(182)
Deferred income taxes	323	(10)	238	39
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	(1,205)	46	(902)	(143)
Amounts reclassified to net earnings	(8)	(19)	(15)	(31)
Deferred income taxes	2	4	4	6
Amounts reclassified to net earnings, net of deferred income taxes	(6)	(15)	(11)	(25)
Other comprehensive earnings (losses), net of deferred income taxes	(1,211)	31	(913)	(168)
Ending balance	(1,606)	(542)	(1,606)	(542)
Currency Translation Adjustments and Other [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	33	(5)	21	(5)
Other comprehensive earnings (losses) before reclassifications	(51)	13	(39)	13
Deferred income taxes	0	(2)	0	(2)
Other comprehensive earnings (losses) before reclassifications, net of deferred income taxes	(51)	11	(39)	11
Amounts reclassified to net earnings	0	0	0	0
Deferred income taxes	0	0	0	0
Amounts reclassified to net earnings, net of deferred income taxes	0	0	0	0
Other comprehensive earnings (losses), net of deferred income taxes	(51)	11	(39)	11
Ending balance	$ (18)	$ 6	$ (18)	$ 6