Derivatives (Net Derivative Gains Losses) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Components of Net Derivatives Gains (Losses)
Derivatives and hedging gains (losses)	$ (1,733)	$ 82	$ (885)	$ 534
Embedded derivatives gains (losses)	821	229	794	120
Total net derivative gains (losses)	$ (912)	$ 311	$ (91)	$ 654