Shareowners' Equity and Noncontrolling Interest Shareowners' Equity and Noncontrolling Interest (Summary of Changes in AOCI) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (7,484)	$ (6,577)	$ (7,484)	$ (6,577)	$ (7,344)	$ (7,619)	$ (7,211)	$ (6,661)
Other comprehensive (loss) income before reclassifications, net - Foreign Currency Translation	(276)	439	(237)	(266)
Amounts reclassified, pretax - Foreign Currency Translation	0	(1)	(1)	1
Tax expense (benefit) reclassified - Foreign Currency Translation	0	0	0	0
Other comprehensive (loss) income before reclassifications, net - Pension	8	4	25	(31)
Amounts reclassified, pretax - Pension	128	218	254	435
Tax expense (benefit) reclassified - Pension	47	82	93	162
Other comprehensive (loss) income before reclassifications, net - AFS Securities	19	4	57	58
Amounts reclassified, pretax - AFS Securities	25	26	52	54
Tax expense (benefit) reclassified - AFS Securities	(7)	(8)	(19)	(18)
Other comprehensive (loss) income before reclassifications, net - Unrealized Hedging (Losses) Gains	26	49	143	(83)
Amounts reclassified, pretax - Unrealized Hedging (Losses) Gains	(45)	(43)	(107)	(100)
Tax expense (benefit) reclassified - Unrealized Hedging (Losses) Gains	11	16	28	32
Other comprehensive (loss) income before reclassifications, net	(237)	488	(73)	(220)
Amounts reclassified, pretax	(148)	(236)	(310)	(480)
Tax (benefit) expense reclassified	51	90	102	176
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(2,685)	(1,278)	(2,685)	(1,278)	(2,411)	(2,438)	(1,718)	(1,051)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(4,999)	(5,405)	(4,999)	(5,405)	(5,072)	(5,135)	(5,537)	(5,709)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	317	330	317	330	316	293	344	308
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(117)	(224)	(117)	(224)	$ (177)	$ (339)	$ (300)	$ (209)
Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive (loss) income before reclassifications, net - Foreign Currency Translation	$ (274)	$ 439	$ (248)	$ (226)