Derivative Financial Instruments (Details 3) (USD $) In Millions	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Components of Net Derivatives Gains (Losses)
Derivatives and hedging gains (losses)	$ 746	$ 3,680	$ (512)	$ 3,199
Embedded derivatives	(394)	(2,199)	549	(1,677)
Net derivative gains (losses)	$ 352	$ 1,481	$ 37	$ 1,522

Net increase (decrease) in the fair value of the embedded derivative or group of embedded derivatives included in earnings in the period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 44A, 44B

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 12-16, 44A, 44B

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration