Financial Instruments Investment Segment and Holding Company Narrative (Details) (Investment Segment [Member], Investment Funds [Member], USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Derivative [Line Items]
Maximum payout amounts relating to put options written	$ 6,500,000,000		$ 2,500,000,000
Open Option Contracts Written, Covered Put Options on Existing Short Positions	6,500,000,000		2,400,000,000
Fair value of derivative instruments with credit-risk related contingent features in a liability position	840,000,000		614,000,000
Cash collateral posted for derivative positions	1,800,000,000		1,200,000,000
Put Option [Member]
Derivative [Line Items]
Realized and unrealized gain (loss) on derivatives, net	$ 41,000,000	$ (1,000,000)