Borrowings and Contractual Commitments Contractual Commitments (Tables)

12 Months Ended

Dec. 31, 2017

Contractual Commitments [Abstract]

Unrecorded Unconditional Purchase Obligations Disclosure [Table Text Block]

	Payments Due by Period
(Dollars in millions)	2018		2019		2020		2021		2022		Thereafter		Total
Unfunded lending commitments		$25,265		$9,648		$13,773		$13,380		$15,879		$12,066		$90,011
Purchase obligations 1	278		260		76		50		48		247		959
Consumer and other time deposits 2, 3	4,720		2,559		1,331		617		834		2,015		12,076
Brokered time deposits 3	105		181		251		194		178		76		985
Commitments to fund partnership investments 4	690		—		—		—		—		—		690