Servicing Activities (Tables)

12 Months Ended

Dec. 31, 2017

Servicing Asset [Abstract]

Schedule Of Total Serviced Automobile Loans Outstanding [Table Text Block]

The current unpaid principal balance and any related unamortized deferred fees and costs of total serviced automotive finance loans and net investment in operating leases outstanding were as follows.

December 31, ($ in millions)	2017		2016
On-balance sheet automotive finance loans and leases
Consumer automotive	$	67,631	$	65,646
Commercial automotive	37,058		38,853
Operating leases	8,682		11,311
Other	121		67
Off-balance sheet automotive finance loans
Securitizations	1,977		2,412
Whole-loan sales	1,409		3,191
Total serviced automotive finance loans and leases	$	116,878	$	121,480