Shareowners' Equity (Changes In Accumulated Other Comprehensive Income ) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Mar. 31, 2010	Dec. 31, 2009
Stockholders Equity Note [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (940)	$ (2,096)	$ (3,711)
Other Comprehensive Income Loss Before Reclassifications Net Of Tax	800	76	(3,306)
Reclassification from OCI net of deferred taxes	356	1,539	1,127
Other Comprehensive Income (Loss), Net of Tax	1,168	1,601	(2,122)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	12	(14)	57
Securities Investment [Member]
Stockholders Equity Note [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	673	(33)	(639)		(653)
Other Comprehensive Income Loss Before Reclassifications Net Of Tax	685	575	(45)
Reclassification from OCI	22	31	59
Reclassification from OCI net of deferred taxes	12	1	32
OCI before reclassifications net of deferred taxes	(386)	(341)	(72)
Other Comprehensive Income (Loss), Net of Tax	707	606	14
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	1	0	0
Currency Translation Adjustment [Member]
Stockholders Equity Note [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(131)	(399)	(1,411)		1,324
Other Comprehensive Income Loss Before Reclassifications Net Of Tax	411	603	(2,787)
Reclassification from OCI	(131)	381	58
Reclassification from OCI net of deferred taxes	(55)	(357)	(22)
OCI before reclassifications net of deferred taxes	261	705	(2,165)
Other Comprehensive Income (Loss), Net of Tax	280	984	(2,729)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	12	(28)	6
Cash Flow Hedge [Member]
Stockholders Equity Note [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(746)	(1,101)		(1,281)	(1,769)
Other Comprehensive Income Loss Before Reclassifications Net Of Tax	(78)	(910)	(437)
Reclassification from OCI	432	1,104	976
Reclassification from OCI net of deferred taxes	75	(204)	(720)
OCI before reclassifications net of deferred taxes	(203)	(248)	498
Other Comprehensive Income (Loss), Net of Tax	354	194	539
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	(1)	14	51
Pension Plans, Defined Benefit [Member]
Stockholders Equity Note [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(736)	(563)	(380)		(434)
Other Comprehensive Income (Loss), Net of Tax	(173)	(183)	54
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	0	0	0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Prior Service Costs Arising During Period, Net of Tax	0	6	(10)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Benefit Plan Improvement, Tax Effect	0	(3)	5
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost Recognized in Net Periodic Pension Cost, Net of Tax	0	2	0
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost Recognized in Net Periodic Pension Cost, Tax	0	0	0
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, Net of Tax	(206)	(198)	10
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, Tax	(86)	(104)	5
Other Comprehensive Income Net Amortization Of Net Actuarial Gain Loss	33	23	34
Other Comprehensive Income Net Amortization Of Net Actuarial Gain Loss Tax	$ 10	$ 11	$ 17