Variable Interest Entities ("VIE's") (Consolidated Variable Interest Entity Asset and Liability Information) (Details) $ in Millions		Sep. 30, 2015 USD ($) item	Dec. 31, 2014 USD ($) item
Assets [Member]
Disclosure Of Variable Interest Entities Assets And Liabilities [Line Items]
Number of Instruments | item	[1]	1	1
Notional Amounts	[1]	$ 459	$ 423
Carrying Value	[1]	$ 598	$ 598
Assets [Member] | Total Return Swap [Member]
Disclosure Of Variable Interest Entities Assets And Liabilities [Line Items]
Number of Instruments | item		1	1
Notional Amounts		$ 459	$ 423
Carrying Value
Liabilities [Member]
Disclosure Of Variable Interest Entities Assets And Liabilities [Line Items]
Number of Instruments | item	[2]	4	4
Notional Amounts	[2]	$ 600	$ 600
Carrying Value	[2]	$ 2	$ 13
Liabilities [Member] | Credit Default Swaps [Member] | Derivative Instruments Not Designated And Not Qualifying As Hedging Instruments [Member]
Disclosure Of Variable Interest Entities Assets And Liabilities [Line Items]
Number of Instruments | item		2	2
Notional Amounts		$ 600	$ 600
Carrying Value		$ 2	$ 13
Liabilities [Member] | Contingent Forwards [Member] | Derivative Instruments Not Designated And Not Qualifying As Hedging Instruments [Member]
Disclosure Of Variable Interest Entities Assets And Liabilities [Line Items]
Number of Instruments | item		2	2
Notional Amounts
Carrying Value
Fixed Maturity Securities [Member] | Assets [Member] | Asset-backed credit card loan securities [Member]
Disclosure Of Variable Interest Entities Assets And Liabilities [Line Items]
Number of Instruments | item
Notional Amounts
Carrying Value		$ 598	$ 598

[1] Reported in variable interest entities' fixed maturity securities on our Consolidated Balance Sheets.

[2] Reported in variable interest entities' liabilities on our Consolidated Balance Sheets.