Employee Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2013

Employee Benefit Plans [Abstract]

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

	2013		2012
Dividend yield	1.28	%	0.91	%
Expected stock price volatility	30.98		39.88
Risk-free interest rate (weighted average)	1.02		1.07
Expected life of options	6 years		6 years

Stock-Based Compensation Expense Recognized in Noninterest Expense

	Three Months Ended June 30				Six Months Ended June 30
(Dollars in millions)	2013		2012		2013		2012
Stock-based compensation expense:
Stock options		$1		$2		$4		$6
Restricted stock	8		8		15		15
RSUs	4		4		13		18
Total stock-based compensation expense		$13		$14		$32		$39

Schedule of Net Benefit Costs [Table Text Block]

	Three Months Ended June 30
	2013						2012
(Dollars in millions)	Pension Benefits			Other Postretirement Benefits			Pension Benefits			Other Postretirement Benefits
Interest cost		$28			$2			$31			$1
Expected return on plan assets	(47		)	(2		)	(43		)	(1		)
Recognized net actuarial loss	7			—			6			—
Net periodic benefit		($12	)		$—			($6	)		$—

	Six Months Ended June 30
	2013						2012
(Dollars in millions)	Pension Benefits			Other Postretirement Benefits			Pension Benefits			Other Postretirement Benefits
Interest cost		$56			$3			$60			$3
Expected return on plan assets	(93		)	(3		)	(86		)	(3		)
Recognized net actuarial loss	13			—			12			—
Net periodic benefit		($24	)		$—			($14	)		$—