Goodwill and Other Intangible Assets (Intangible Assets Subject to Amortization) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 5,277		$ 5,131
Accumulated amortization	(4,002)		(3,995)
Intangible Assets, Net (Excluding Goodwill)	1,275		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	316		322
Amortization expense	97	108
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	1,325		1,173
Accumulated amortization	(805)		(802)
Net	520		371
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	46		49
Accumulated amortization	(34)		(36)
Net	12		13
Patents, Licenses And Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	108		106
Accumulated amortization	(103)		(102)
Net	5		4
Computer Software, Intangible Asset [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	2,212		2,200
Accumulated amortization	(1,721)		(1,707)
Net	491		493
Leases, Acquired-in-Place [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	679		703
Accumulated amortization	(480)		(498)
Net	199		205
Present Value Of Future Profits [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	583		574
Accumulated amortization	(583)		(574)
Net	0		0
All Other [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	324		326
Accumulated amortization	(276)		(276)
Net	$ 48		$ 50