Acquisitions, Goodwill and Other Intangible Assets (Intangible Assets Subject to Amortization) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended		12 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount		$ 3,146		$ 3,146		$ 2,933
Accumulated amortization		(1,971)		(1,971)		(2,058)
Net		1,177		1,177		875
Intangible Assets, Net (Excluding Goodwill)	[1]	1,177		1,177		875
Increase (Decrease) in Intangible Assets, Current				302		353
Amortization expense		74	$ 69	239	$ 198		$ 0
Adjustment To Present Value Of Future Profits In Run Off Insurance Operation		272		272		293
Goodwill Dispositions, currency exchange and other				724
Customer Relationship [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount		1,139		1,139		926
Accumulated amortization		(501)		(501)		(489)
Net		638		638		437
Capitalized software
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount		947		947		1,228
Accumulated amortization		(675)		(675)		(843)
Net		272		272		385
Lease valuations
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount		107		107		0
Accumulated amortization		(16)		(16)		0
Net		92		92		0
Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount		38		38		22
Accumulated amortization		(7)		(7)		(12)
Net		32		32		10
Patentts and technology
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount		9		9		9
Accumulated amortization		(7)		(7)		(6)
Net		3		3		3
PVFP
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount		643		643		614
Accumulated amortization		(643)		(643)		(614)
Net		0		0		0
All other
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount		263		263		134
Accumulated amortization		(122)		(122)		(94)
Net		$ 141		$ 141		$ 40

[1] Amounts may not add due to rounding.