Derivatives (Net Derivative Gains Losses) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Components of Net Derivatives Gains (Losses)
Derivatives and hedging gains (losses)	$ 82	$ (2,769)	$ 534	$ (5,083)
Embedded derivatives	229	1,079	120	2,763
Total net derivative gains (losses)	$ 311	$ (1,690)	$ 654	$ (2,320)