Debt and Borrowing Arrangements (Details 4) (USD $)	Sep. 30, 2013
Term notes, in revolving period
Debt and Borrowing Arrangements
Capacity	$ 1,300,000,000
Utilized Capacity	1,300,000,000
Variable-funding notes
Debt and Borrowing Arrangements
Capacity	2,092,000,000
Utilized Capacity	1,259,000,000
Available Capacity	833,000,000
Secured Canadian credit facility
Debt and Borrowing Arrangements
Capacity	121,000,000
Available Capacity	121,000,000
Committed warehouse facilities
Debt and Borrowing Arrangements
Capacity	3,143,000,000
Utilized Capacity	988,000,000
Available Capacity	2,155,000,000
Servicing advance facility
Debt and Borrowing Arrangements
Capacity	120,000,000
Utilized Capacity	64,000,000
Available Capacity	56,000,000
Unsecured credit facilities
Debt and Borrowing Arrangements
Capacity	305,000,000
Available Capacity	305,000,000
Uncommitted facilities
Debt and Borrowing Arrangements
Available Capacity	$ 2,300,000,000