Guarantees and Commitments Guarantees and Commitments (Tables)

12 Months Ended

Dec. 31, 2017

Guarantees and Commitments [Abstract]

Schedule of Guarantor Obligations [Table Text Block]

Guarantees are defined as contracts or indemnification agreements that contingently require us to make payments to third parties based on changes in the underlying agreements with the guaranteed parties. The following summarizes our outstanding guarantees, including those of our discontinued operations, made to third parties on our Consolidated Balance Sheet, for the periods shown.

	2017				2016
December 31, ($ in millions)	Maximum liability		Carrying value of liability		Maximum liability		Carrying value of liability
Standby letters of credit and other guarantees	$	227	$	8	$	175	$	8

Financing Commitments [Table Text Block]

The contractual commitments were as follows.

December 31, ($ in millions)	2017		2016
Unused revolving credit line commitments and other (a)	$	2,341	$	1,995
Home equity lines of credit (b)	318		356
Commitments to provide capital to investees (c)	283		206
Construction-lending commitments (d)	144		164
Mortgage loan origination commitments (e)	95		—

(a) The unused portion of revolving lines of credit reset at prevailing market rates and, as such, approximate market value.

(b) We are committed to fund the remaining unused balances on home equity lines of credit.

(c) We are committed to contribute capital to certain investees. The fair value of these commitments is considered in the overall valuation of the underlying assets with which they are associated.

(d) The fair value of these commitments is considered in the overall valuation of the related assets.

(e) Commitments with mortgage loan applicants in which the loan terms, including interest rate and price, are guaranteed for a designated period of time subject to the completion of underwriting procedures.

Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]

Future minimum rental payments required under operating leases, primarily for real property, with noncancelable lease terms expiring after December 31, 2017, are as follows.

Year ended December 31, ($ in millions)
2018	$	35
2019	35
2020	34
2021	36
2022	33
2023 and thereafter	316
Total minimum payment required	$	489

Long-term Purchase Commitment [Table Text Block]

We have entered into multiple agreements for information technology, voice and communication technology, and related maintenance. Many of the agreements are subject to variable price provisions, fixed or minimum price provisions, and termination or renewal provisions.

Year ended December 31, ($ in millions)
2018	$	85
2019 and 2020	36
2021 and thereafter	2
Total future payment obligations	$	123