Derivatives (Net Derivative Gains Losses) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Components of Net Derivatives Gains (Losses)
Derivatives and hedging gains (losses)	$ 452	$ (2,314)
Embedded derivatives	(109)	1,684
Total net derivative gains (losses)	$ 343	$ (630)