Borrowings and Bank Deposits (Footnote) (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Borrowings And Bank Deposits [Line Items]
Long-term borrowings (Note 6)	$ 169,461	$ 186,759
Bank deposits (Note 6)	45,799	43,841
Short-term borrowings (Note 6)	64,138	67,705
Non Recourse Borrowings Of Consolidated Securitization Entities	16,991	$ 19,369
Subordinated Debenture [Member] | Subsidiary Issuer [Member]
Borrowings And Bank Deposits [Line Items]
Long-term borrowings (Note 6)	$ 2,627