Variable Interest Entities ("VIE's") (Consolidated Variable Interest Entity Asset and Liability Information) (Details) $ in Millions		Dec. 31, 2016 USD ($) item	Dec. 31, 2015 USD ($) item
Assets
Disclosure Of Variable Interest Entities Assets And Liabilities [Line Items]
Number of Instruments | item		2	1
Notional Amounts		$ 733	$ 479
Carrying Value		$ 200	$ 598
Assets | Total Return Swap [Member]
Disclosure Of Variable Interest Entities Assets And Liabilities [Line Items]
Number of Instruments | item		1	1
Notional Amounts		$ 533	$ 479
Assets | Credit default swaps [Member]
Disclosure Of Variable Interest Entities Assets And Liabilities [Line Items]
Number of Instruments | item		1
Notional Amounts		$ 200
Liabilities
Disclosure Of Variable Interest Entities Assets And Liabilities [Line Items]
Number of Instruments | item	[1]	1	4
Notional Amounts	[1]		$ 600
Carrying Value	[1]		$ 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		1	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	[2]
Notional Amounts	[2]
Carrying Value	[2]	$ 200	$ 598

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

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