Fair Value Measurements (Details 5) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010
Fair Value Measurements (Textuals) [Abstract]
Loans held for sale	$ 25		$ 15
Nonexit price methodology for valuing loan portfolio	0.60%
Loans, net of allowance	46,610		48,503		51,115
Loans held for sale	381	426	467	637	699	556
Deconsolidated direct and indirect investments	234
Level 3 [Member]
Fair Value Measurements (Textuals) [Abstract]
Loans held for sale	25		15
Carrying Amount [Member]
Fair Value Measurements (Textuals) [Abstract]
Loans, net of allowance	46,610		48,503
Loans held for sale	381		467
Carrying Amount [Member] | Discontinued Operation or Asset Disposal [Member]
Fair Value Measurements (Textuals) [Abstract]
Loans, net of allowance	3,100		3,200
Loans held for sale	0		15
Fair Value [Member]
Fair Value Measurements (Textuals) [Abstract]
Loans, net of allowance	45,759		46,140
Loans held for sale	381		467
Fair Value [Member] | Discontinued Operation or Asset Disposal [Member]
Fair Value Measurements (Textuals) [Abstract]
Loans, net of allowance	2,800		2,800
Residential Real Estate Mortgage Loans [Member]
Fair Value Measurements (Textuals) [Abstract]
Loans, net of allowance	$ 1,800		$ 1,800