Goodwill and Other Intangible Assets (Intangible Assets Subject to Amortization) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 5,131	$ 5,489
Accumulated amortization	(3,995)	(4,202)
Net	1,136	1,287
Intangible Assets, Net (Excluding Goodwill)	1,136	1,287
Increase (Decrease) in Intangible Assets, Current	270
Amortization expense	425	447	562
2014	339
2015	288
2016	218
2017	154
2018	100
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	1,173	1,220
Accumulated amortization	(802)	(802)
Net	371	418
Finite-lived Intangible Assets Acquired	115
Finite-Lived Intangible Assets, Useful Life Average	7.0
Patents And Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	106	106
Accumulated amortization	(102)	(99)
Net	4	7
Finite-lived Intangible Assets Acquired	3
Finite-Lived Intangible Assets, Useful Life Average	5.0
Computer Software, Intangible Asset [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	2,200	2,103
Accumulated amortization	(1,707)	(1,663)
Net	493	440
Finite-lived Intangible Assets Acquired	150
Finite-Lived Intangible Assets, Useful Life Average	4.0
Leases, Acquired-in-Place [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	703	1,163
Accumulated amortization	(498)	(792)
Net	205	371
Finite-lived Intangible Assets Acquired	2
Finite-Lived Intangible Assets, Useful Life Average	5.0
Present Value Of Future Profits [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	574	530
Accumulated amortization	(574)	(530)
Net	0	0
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	322	353
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	49	51
Accumulated amortization	(36)	(32)
Net	13	19
All Other [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	326	316
Accumulated amortization	(276)	(284)
Net	$ 50	$ 32