Trading Assets and Liabilities and Derivatives Trading Assets and Liabilities and Derivatives (Tables)

6 Months Ended

Jun. 30, 2016

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Financial Instruments Owned and Pledged as Collateral [Table Text Block]

(Dollars in millions)	June 30, 2016		December 31, 2015
Pledged trading assets to secure repurchase agreements 1		$821		$986
Pledged trading assets to secure derivative agreements	467		393
Pledged trading assets to secure other arrangements	40		40

¹ Repurchase agreements secured by collateral totaled $787 million and $950 million at June 30, 2016 and December 31, 2015, respectively.