Shareowners' Equity and Noncontrolling Interest (Reclass and 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
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Balance at June 30, 2015	$ (6,577)	$ (2,403)	$ (6,661)	$ (2,880)
Other comprehensive income (loss) before reclassifications, net	(999)	(858)	(1,219)	(526)
Amounts reclassified, pretax	278	129	758	341
Tax (benefit) expense reclassified	592	575	1,748	1,610
Balance at September 30, 2015	(7,388)	(3,169)	(7,388)	(3,169)
Foreign Currency Translation [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Balance at June 30, 2015	(1,278)	495	(1,051)	170
Other comprehensive income (loss) before reclassifications, net	(913)	(717)	(1,139)	(395)
Amounts reclassified, pretax	0	1	(1)	4
Tax (benefit) expense reclassified	0	0	0	0
Balance at September 30, 2015	(2,191)	(221)	(2,191)	(221)
Defined Benefit Pension and Post-retirement Plans [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Balance at June 30, 2015	(5,405)	(3,127)	(5,709)	(3,267)
Other comprehensive income (loss) before reclassifications, net	73	9	104	10
Amounts reclassified, pretax	216	104	651	312
Tax (benefit) expense reclassified	81	37	243	106
Balance at September 30, 2015	(5,197)	(3,051)	(5,197)	(3,051)
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Balance at June 30, 2015	330	272	308	296
Other comprehensive income (loss) before reclassifications, net	(48)	(37)	10	(43)
Amounts reclassified, pretax	(2)	0	(56)	(30)
Tax (benefit) expense reclassified	(7)	0	(25)	(12)
Balance at September 30, 2015	287	235	287	235
Unrealized Hedging (Losses) Gain [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Balance at June 30, 2015	(224)	(43)	(209)	(79)
Other comprehensive income (loss) before reclassifications, net	(111)	(113)	(194)	(98)
Amounts reclassified, pretax	64	24	164	55
Tax (benefit) expense reclassified	16	0	48	10
Balance at September 30, 2015	(287)	(132)	(287)	(132)
Accumulated Other Comprehensive (Loss) Income [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Tax (benefit) expense reclassified	$ 90	$ 37	$ 266	$ 104