Finite Lived Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Finite Lived Intangible Assets Net [Line Items]
Cost	$ 3,723	$ 3,516
Accumulated amortization	2,038	1,739
Net carrying value	1,685	1,777
Other Assets [Member]
Finite Lived Intangible Assets Net [Line Items]
Cost	1,613	1,606
Accumulated amortization	711	546
Net carrying value	902	1,060
Customer Relationships [Member]
Finite Lived Intangible Assets Net [Line Items]
Cost	1,289
Accumulated amortization	635
Net carrying value	654
Customer Relationships [Member] | Other Assets [Member]
Finite Lived Intangible Assets Net [Line Items]
Cost		1,278
Accumulated amortization		466
Net carrying value		812
Other Intangibles [Member]
Finite Lived Intangible Assets Net [Line Items]
Cost	324
Accumulated amortization	76
Net carrying value	248
Other Intangibles [Member] | Other Assets [Member]
Finite Lived Intangible Assets Net [Line Items]
Cost		328
Accumulated amortization		80
Net carrying value		248
Value Of Business Acquired [Member] | Deferred Policy Acquisition Costs [Member]
Finite Lived Intangible Assets Net [Line Items]
Cost	168	172
Accumulated amortization	20	2
Net carrying value	148	170
Internal-use software [Member] | Property And Equipment [Member]
Finite Lived Intangible Assets Net [Line Items]
Cost	1,942	1,738
Accumulated amortization	1,307	1,191
Net carrying value	$ 635	$ 547