Derivatives (Net Derivative Gains Losses) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Components of Net Derivatives Gains (Losses)
Derivatives and hedging gains (losses)	$ 2,318	$ 543	$ 1,433	$ 1,077
Embedded derivatives gains (losses)	(1,833)	(65)	(1,039)	55
Total net derivative gains (losses)	$ 485	$ 478	$ 394	$ 1,132