Financial Instruments Derivative Activities Table (Details) - USD ($) $ in Millions		Sep. 30, 2015	Dec. 31, 2014
Credit Default Swap [Member]
Derivative [Line Items]
Long Notional Exposure	[1]	$ 201	$ 389
Short Notional Exposure	[1]	1,619	1,493
Equity swaps
Derivative [Line Items]
Long Notional Exposure		1	1
Short Notional Exposure		15,957	11,312
Foreign currency forwards
Derivative [Line Items]
Long Notional Exposure		0	0
Short Notional Exposure		866	1,578
Interest rate swap contracts
Derivative [Line Items]
Long Notional Exposure	[2]	0	0
Short Notional Exposure	[2]	137	137
Commodity contracts
Derivative [Line Items]
Long Notional Exposure		40	36
Short Notional Exposure		632	234
Investment Segment [Member] | Credit Default Swap [Member]
Derivative [Line Items]
Notional value of interest rate swap agreements		7,900	9,300
Short Notional Exposure		1,600	1,500
Investment Segment [Member] | Equity swaps
Derivative [Line Items]
Long Notional Exposure		3,200	108
Investment Segment [Member] | Interest rate swap contracts
Derivative [Line Items]
Notional value of interest rate swap agreements		16,000	16,000
Notional Exposure of Derivatives, Short Position, less than three months		$ 74	74
Short Notional Exposure			137
Investment Segment [Member] | Credit Default Swap, Selling Protection [Member]
Derivative [Line Items]
Short Notional Exposure	[1]		$ 3

[1] The short notional amount on our credit swap positions is approximately $7.9 billion and $9.3 billion as of September 30, 2015 and December 31, 2014, respectively. However, because credit spreads cannot compress below zero, our downside short notional exposure to loss is approximately $1.6 billion and $1.5 billion as of September 30, 2015 and December 31, 2014, respectively.

[2] The short notional amount on certain of our interest rate contracts with a three month duration is approximately $16.0 billion as of both September 30, 2015 and December 31, 2014. We assume that interest rates will not fall below zero and therefore our downside short notional exposure to loss on these contracts is $74 million (of the total $137 million disclosed in the above table) as of both September 30, 2015 and December 31, 2014.