Goodwill and Other Intangible Assets (Intangible Assets Subject to Amortization) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 26,893		$ 26,893		$ 26,061
Accumulated amortization	(12,230)		(12,230)		(11,911)
Net	14,663		14,663		14,150
Intangible Assets, Net (Excluding Goodwill)	14,798		14,798		14,310
Adjustments To Reflect Present Value Of Future Profits In Run Off Insurance Operations To Reflect Effects That Would Have Been Recognized Had Related Unrealized Investment Securities Holding Gains Loses Actually Been Realized	305		305		322
Increase (Decrease) in Intangible Assets, Current			832
Amortization expense	431	429	851	828
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	8,571		8,571		7,938
Accumulated amortization	(2,510)		(2,510)		(2,312)
Net	6,061		6,061		5,626
Patents And Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	6,865		6,865		6,602
Accumulated amortization	(2,819)		(2,819)		(2,621)
Net	4,046		4,046		3,981
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	1,210		1,210		1,356
Accumulated amortization	(271)		(271)		(295)
Net	939		939		1,061
Computer Software, Intangible Asset [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	8,486		8,486		8,256
Accumulated amortization	(5,249)		(5,249)		(5,252)
Net	3,237		3,237		3,004
Leases, Acquired-in-Place [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	644		644		703
Accumulated amortization	(468)		(468)		(498)
Net	176		176		205
Present Value Of Future Profits [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	596		596		574
Accumulated amortization	(596)		(596)		(574)
Net	0		0		0
All Other [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	521		521		632
Accumulated amortization	(317)		(317)		(359)
Net	$ 204		$ 204		$ 273