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	$ 5,304		$ 5,304		$ 5,131
Accumulated amortization	(4,019)		(4,019)		(3,995)
Intangible Assets, Net (Excluding Goodwill)	1,285		1,285		1,136
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
Amortization expense	102	111	199	219
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	1,357		1,357		1,173
Accumulated amortization	(838)		(838)		(802)
Net	519		519		371
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	48		48		49
Accumulated amortization	(35)		(35)		(36)
Net	13		13		13
Patents, Licenses And Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	88		88		106
Accumulated amortization	(82)		(82)		(102)
Net	6		6		4
Computer Software, Intangible Asset [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	2,284		2,284		2,200
Accumulated amortization	(1,753)		(1,753)		(1,707)
Net	531		531		493
Leases, Acquired-in-Place [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	644		644		703
Accumulated amortization	(469)		(469)		(498)
Net	175		175		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	287		287		326
Accumulated amortization	(246)		(246)		(276)
Net	$ 41		$ 41		$ 50