Derivatives (Net Derivative Gains Losses) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Components of Net Derivatives Gains (Losses)
Derivatives and hedging gains (losses)	$ (1,444)	$ (945)	$ (6,527)	$ (1,277)
Embedded derivatives	898	227	3,661	673
Total net derivative gains (losses)	$ (546)	$ (718)	$ (2,866)	$ (604)