Shareowners' Equity (Changes In Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss) Beginning balance				$ (18,172)
Benefit (provision) for income taxes	[1]	$ 365	$ 401	7,466	$ 1,034
Other comprehensive income, net of tax		1,214	(960)	1,144	1,009
Less Other comprehensive income (loss) attributable to noncontrolling interests		(8)	(8)	(45)	(1)
Accumulated Other Comprehensive Income (Loss) Ending balance		(16,983)	(8,110)	(16,983)	(8,110)
Investment Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss) Beginning balance		564	1,040	1,013	307
OCI before reclassification tax		14	(146)	(196)	310
Other comprehensive income (OCI) before reclassifications - net of deferred taxes		22	(265)	(382)	484
Benefit (provision) for income taxes		(20)	(15)	(45)	(19)
Reclassification from OCI net of deferred taxes		(26)	(19)	(70)	(34)
Other comprehensive income, net of tax		(3)	(284)	(452)	450
Less Other comprehensive income (loss) attributable to noncontrolling interests		0	1	0	2
Accumulated Other Comprehensive Income (Loss) Ending balance		561	755	561	755
Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss) Beginning balance		(5,914)	61	(2,427)	126
OCI before reclassification tax		(185)	198	1,158	314
Other comprehensive income (OCI) before reclassifications - net of deferred taxes		(108)	(1,575)	(3,936)	(1,674)
Benefit (provision) for income taxes		(628)	1	(779)	124
Reclassification from OCI net of deferred taxes		733	(15)	1,039	25
Other comprehensive income, net of tax		624	(1,590)	(2,896)	(1,649)
Less Other comprehensive income (loss) attributable to noncontrolling interests		(8)	(11)	(43)	(5)
Accumulated Other Comprehensive Income (Loss) Ending balance		(5,281)	(1,518)	(5,281)	(1,518)
Cash Flow Hedge
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss) Beginning balance		(140)	(176)	(180)	(257)
OCI before reclassification tax		(28)	(44)	(24)	(5)
Other comprehensive income (OCI) before reclassifications - net of deferred taxes		(133)	(329)	(626)	(421)
Benefit (provision) for income taxes		11	30	59	39
Reclassification from OCI net of deferred taxes		98	384	632	557
Other comprehensive income, net of tax		(35)	55	6	136
Less Other comprehensive income (loss) attributable to noncontrolling interests		0	0	0	0
Accumulated Other Comprehensive Income (Loss) Ending balance		(174)	(121)	(174)	(121)
Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss) Beginning balance		(12,716)	(8,083)	(16,578)	(9,296)
Other comprehensive income, net of tax		627	859	4,486	2,072
Less Other comprehensive income (loss) attributable to noncontrolling interests		0	2	(2)	2
Prior Service credit (costs)- net of deferred taxes		0	374	2,090	374
Net actuarial gain (loss), Tax		0	(58)	269	(26)
Net actuarial gain (loss) - net of deferred taxes		43	(107)	602	59
Prior service credit (costs), tax		0	212	1,194	212
Net curtailment/settlement, tax		0	41	(44)	41
Net curtailment/settlement - net of deferred taxes		0	72	(77)	72
Prior service cost amortization, tax		17	62	92	192
Prior service cost amortization - net of deferred taxes		0	85	101	273
Net actuarial loss amortization, tax		297	213	902	637
Net actuarial loss amortization - net of deferred taxes		584	435	1,771	1,294
Accumulated Other Comprehensive Income (Loss) Ending balance		$ (12,089)	$ (7,226)	$ (12,089)	$ (7,226)

[1] Amounts may not add due to rounding.