Variable Interest Entities ("VIE's") (Consolidated Variable Interest Entity Asset and Liability Information) (Details) $ in Millions		Jun. 30, 2016 USD ($) item	Dec. 31, 2015 USD ($) item
Assets
Disclosure Of Variable Interest Entities Assets And Liabilities [Line Items]
Number of Instruments | item		3	1
Notional Amounts		$ 1,094	$ 479
Carrying Value		$ 601	$ 598
Assets | Total Return Swap [Member]
Disclosure Of Variable Interest Entities Assets And Liabilities [Line Items]
Number of Instruments | item		1	1
Notional Amounts		$ 494	$ 479
Carrying Value
Assets | Credit default swaps [Member]
Disclosure Of Variable Interest Entities Assets And Liabilities [Line Items]
Number of Instruments | item	[1]	2
Notional Amounts	[1]	$ 600
Carrying Value	[1]	$ 1
Liabilities
Disclosure Of Variable Interest Entities Assets And Liabilities [Line Items]
Number of Instruments | item	[2]	2	4
Notional Amounts	[2]		$ 600
Carrying Value	[2]		$ 4
Liabilities | Credit default swaps [Member] | Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments
Disclosure Of Variable Interest Entities Assets And Liabilities [Line Items]
Number of Instruments | item			2
Notional Amounts			$ 600
Carrying Value			$ 4
Liabilities | Contingent forwards | Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments
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 | Asset-backed credit card loans [Member]
Disclosure Of Variable Interest Entities Assets And Liabilities [Line Items]
Number of Instruments | item	[3]
Notional Amounts	[3]
Carrying Value	[3]	$ 600	$ 598

[1] Reported in other investments on our Consolidated Balance Sheets.

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

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