Federal Funds Sold and Securities Borrowed or Purchased Under Agreements to Resell (Tables)

12 Months Ended

Dec. 31, 2015

Securities Purchased under Agreements to Resell [Abstract]

Schedule of Resale Agreements [Table Text Block]

(Dollars in millions)	December 31, 2015		December 31, 2014
Fed funds sold		$38		$38
Securities borrowed	277		290
Securities purchased under agreements to resell	962		832
Total Fed funds sold and securities borrowed or purchased under agreements to resell		$1,277		$1,160

Securities sold under agreements to repurchase remaining contractual maturity [Table Text Block]

	December 31, 2015						December 31, 2014
(Dollars in millions)	Overnight and Continuous		Up to 30 days		Total		Overnight and Continuous		Up to 30 days		Total
U.S. Treasury securities		$112		$—		$112		$376		$—		$376
Federal agency securities	319		—		319		231		—		231
MBS - agency	837		23		860		1,059		45		1,104
CP	49		—		49		238		—		238
Corporate and other debt securities	242		72		314		327		—		327
Total securities sold under agreements to repurchase		$1,559		$95		$1,654		$2,231		$45		$2,276

Netting of Financial Instruments - Repurchase Agreements [Table Text Block]

(Dollars in millions)	Gross Amount		Amount Offset		Net Amount Presented in Consolidated Balance Sheets			Held/Pledged Financial Instruments		Net Amount
December 31, 2015
Financial assets:
Securities borrowed or purchased under agreements to resell		$1,239		$—		$1,239	1		$1,229		$10
Financial liabilities:
Securities sold under agreements to repurchase	1,654		—		1,654			1,654		—
December 31, 2014
Financial assets:
Securities borrowed or purchased under agreements to resell		$1,122		$—		$1,122	1		$1,112		$10
Financial liabilities:
Securities sold under agreements to repurchase	2,276		—		2,276			2,276		—

¹ Excludes $38 million of Fed funds sold, which are not subject to a master netting agreement at both December 31, 2015 and 2014.