Shareowners' Equity and Noncontrolling Interest (Reclass and Changes in Accumulated Other Comprehensive Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive (loss) income	$ (3,169)	$ (5,325)	$ (3,169)	$ (5,325)	$ (2,403)	$ (2,880)	$ (6,000)	$ (5,448)
Other Comprehensive (Loss) Income , before Reclassifications, Net	(858)	538	(526)	(320)
Amounts reclassified, pretax	129	197	341	650
Tax (benefit) expense reclassified	(608)	(614)	(1,534)	(1,677)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive (loss) income	(132)	(28)	(132)	(28)	(43)	(79)	(100)	3
Other Comprehensive (Loss) Income , before Reclassifications, Net	(113)	72	(98)	(48)
Amounts reclassified, pretax	24	(1)	55	20
Tax (benefit) expense reclassified	0	1	(10)	(3)
Accumulated Other Comprehensive Income (Loss) [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Tax (benefit) expense reclassified	(37)	(60)	(104)	(207)
Accumulated Translation Adjustment [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive (loss) income	(221)	246	(221)	246	495	170	(172)	654
Other Comprehensive (Loss) Income , before Reclassifications, Net	(717)	419	(395)	(439)
Amounts reclassified, pretax	1	(1)	4	31
Tax (benefit) expense reclassified	0	0	0	0
Accumulated Defined Benefit Plans Adjustment [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive (loss) income	(3,051)	(5,778)	(3,051)	(5,778)	(3,127)	(3,267)	(5,922)	(6,250)
Other Comprehensive (Loss) Income , before Reclassifications, Net	9	(11)	10	27
Amounts reclassified, pretax	104	226	312	680
Tax (benefit) expense reclassified	(37)	(71)	(106)	(235)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive (loss) income	235	235	235	235	272	296	194	145
Other Comprehensive (Loss) Income , before Reclassifications, Net	(37)	58	(43)	140
Amounts reclassified, pretax	0	(27)	(30)	(81)
Tax (benefit) expense reclassified	$ 0	$ 10	$ 12	$ 31