Fair Value Option (Details Textual) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Fair Value Option (Textual) [Abstract]
Fixed rate debt accounted for under fair value option	$ 11,800,000,000		$ 11,800,000,000		$ 14,100,000,000
Component of long-term debt under fair value option	11,300,000,000		11,300,000,000		13,700,000,000
Component of due to affiliates under fair value option	466,000,000		466,000,000		447,000,000
Fair value option not elected related to fixed rate long-term debt	9,400,000,000		9,400,000,000		11,800,000,000
Aggregate unpaid principal balance of Fixed rate debt accounted for under fair value option	11,200,000,000		11,200,000,000		13,900,000,000
Increased the debt balance	257,000,000				341,000,000
Foreign currency translation gains (losses) recorded in derivative related income (expense) associated with debt designated at fair value	144,000,000	115,000,000	84,000,000	292,000,000
Offsetting gains (losses) recorded in derivative related income (expense) associated with the related derivatives	144,000,000	115,000,000	84,000,000	292,000,000
Increased the value of debt through fair value option adjustments	$ 602,000,000		$ 602,000,000		$ 232,000,000