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

12 Months Ended

Dec. 31, 2017

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Trading Securities [Table Text Block]

The fair values of the components of trading assets and liabilities and derivative instruments are presented in the following table:

(Dollars in millions)	December 31, 2017		December 31, 2016
Trading Assets and Derivative Instruments:
U.S. Treasury securities		$157		$539
Federal agency securities	395		480
U.S. states and political subdivisions	61		134
MBS - agency	700		567
CLO securities	—		1
Corporate and other debt securities	655		656
CP	118		140
Equity securities	56		49
Derivative instruments 1	802		984
Trading loans 2	2,149		2,517
Total trading assets and derivative instruments		$5,093		$6,067
Trading Liabilities and Derivative Instruments:
U.S. Treasury securities		$577		$697
MBS - agency	—		1
Corporate and other debt securities	289		255
Equity securities	9		—
Derivative instruments 1	408		398
Total trading liabilities and derivative instruments		$1,283		$1,351

¹ Amounts include the impact of offsetting cash collateral received from and paid to the same derivative counterparties, and the impact of netting derivative assets and derivative liabilities when a legally enforceable master netting agreement or similar agreement exists.

² Includes loans related to TRS.

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

Pledged trading assets are presented in the following table:

(Dollars in millions)	December 31, 2017		December 31, 2016
Pledged trading assets to secure repurchase agreements 1		$1,016		$968
Pledged trading assets to secure certain derivative agreements	72		471
Pledged trading assets to secure other arrangements	41		40

¹ Repurchase agreements secured by collateral totaled $975 million and $928 million at December 31, 2017 and 2016, respectively.