Derivatives (Net Derivative Gains Losses) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Components of Net Derivatives Gains (Losses)
Derivatives and hedging gains (losses)	$ 2,525	$ (1,733)	$ 5,029	$ (885)
Embedded derivatives gains (losses)	(4,624)	821	(5,793)	794
Total net derivative gains (losses)	$ (2,099)	$ (912)	$ (764)	$ (91)