Employee Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2014

Employee Benefit Plans [Abstract]

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

Dividend yield	1.28	%
Expected stock price volatility	30.98
Risk-free interest rate (weighted average)	1.02
Expected life of options	6 years

Stock-Based Compensation Expense Recognized in Noninterest Expense

	Three Months Ended June 30				Six Months Ended June 30
(Dollars in millions)	2014		2013		2014		2013
Stock-based compensation expense:
Stock options		$—		$1		$1		$4
Restricted stock	6		8		14		15
RSUs	7		4		21		13
Total stock-based compensation expense		$13		$13		$36		$32

Schedule of Net Benefit Costs [Table Text Block]

	Six Months Ended June 30
	2014							2013
(Dollars in millions)	Pension Benefits				Other Postretirement Benefits			Pension Benefits				Other Postretirement Benefits
Service cost		$2		1		$—			$2		1		$—
Interest cost	62				2			56				3
Expected return on plan assets	(100		)	1	(3		)	(95		)	1	(3		)
Amortization of prior service credit	—				(3		)	—				—
Recognized net actuarial loss	8				—			13				—
Net periodic benefit		($28	)			($4	)		($24	)			$—

	Three Months Ended June 30
	2014							2013
(Dollars in millions)	Pension Benefits				Other Postretirement Benefits			Pension Benefits				Other Postretirement Benefits
Service cost		$1		1		$—			$1		1		$—
Interest cost	31				1			28				2
Expected return on plan assets	(50		)	1	(1		)	(48		)	1	(2		)
Amortization of prior service credit	—				(2		)	—				—
Recognized net actuarial loss	4				—			7				—
Net periodic benefit		($14	)			($2	)		($12	)			$—