Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2015

Employee Benefit Plans [Abstract]

Stock-Based Compensation Expense Recognized in Noninterest Expense

	Three Months Ended September 30				Nine Months Ended September 30
(Dollars in millions)	2015		2014		2015		2014
Stock options		$—		$—		$1		$1
Restricted stock	4		7		13		21
Performance stock units	5		4		21		9
RSUs	7		5		35		27
Total stock-based compensation		$16		$16		$70		$58
Stock-based compensation tax benefit		$6		$6		$27		$22

Schedule of Net Benefit Costs [Table Text Block]

	Pension Benefits 1												Other Postretirement Benefits
	Three Months Ended September 30						Nine Months Ended September 30						Three Months Ended September 30						Nine Months Ended September 30
(Dollars in millions)	2015			2014			2015			2014			2015			2014			2015			2014
Service cost		$2			$2			$4			$4			$—			$—			$—			$—
Interest cost	29			31			87			93			1			1			2			2
Expected return on plan assets	(52		)	(50		)	(155		)	(150		)	(2		)	(1		)	(4		)	(4		)
Amortization of prior service credit	—			—			—			—			(1		)	(2		)	(4		)	(4		)
Amortization of actuarial loss	5			4			16			12			—			—			—			—
Net periodic benefit		($16	)		($13	)		($48	)		($41	)		($2	)		($2	)		($6	)		($6	)