Employee Retirement Benefits (Tables)

12 Months Ended

Dec. 31, 2012

Compensation and Retirement Disclosure [Abstract]

Net Periodic Benefit Costs [Table Text Block]

The following table displays components of our net periodic benefit cost for our qualified and nonqualified pension plans and other postretirement plan for the years ended December 31, 2012, 2011 and 2010. The net periodic benefit cost for each period is calculated based on assumptions at the end of the prior year.

	For the Year Ended December 31,
	2012								2011								2010
					Other Post-								Other Post-								Other Post-
	Pension				Retirement				Pension				Retirement				Pension				Retirement
	Plans				Plan				Plans				Plan				Plans				Plan
	(Dollars in millions)
Service cost		$	37			$	6			$	39			$	6			$	37			$	6
Interest cost		72				9				72				9				66				9
Expected return on plan assets		(73		)		—				(69		)		—				(60		)		—
Other		30				(3		)		12				(7		)		9				(2		)
Net periodic benefit cost		$	66			$	12			$	54			$	8			$	52			$	13

Pre- and Post-tax Amounts Recognized in AOCI [Table Text Block]

The following table displays the changes in the pre-tax and after-tax amounts recognized in AOCI that have not been recognized as a component of net periodic benefit cost for the years ended December 31, 2012 and 2011.

	For the Year Ended
	2012								2011
					Other Post-								Other Post-
	Pension				Retirement				Pension				Retirement
	Plans				Plan				Plans				Plan
	(Dollars in millions)
Actuarial Loss:
Beginning balance, January 1		$	393			$	36			$	218			$	42
Current year actuarial loss (gain)		135				8				184				(5		)
Amortization		(29		)		(1		)		(9		)		(1		)
Ending balance, December 31		499				43				393				36
Prior Service Cost (Credit):
Beginning balance, January 1		$	4			$	(46	)		$	6			$	(56	)
Prior service credit due to curtailments		—				—				—				5
Amortization		(1		)		6				(2		)		5
Ending balance, December 31		3				(40		)		4				(46		)
Transition Obligation:
Beginning balance, January 1		$	—			$	2			$	—			$	4
Amortization		—				(2		)		—				(2		)
Ending balance, December 31		—				—				—				2
Pre-tax and after-tax amount recorded in AOCI		$	502			$	3			$	397			$	(8	)

Status of Pension and Other Postretirement Plans [Table Text Block]

The following table displays the status of our pension and other postretirement plans as of December 31, 2012 and 2011.

	As of December 31,
	2012								2011
					Other Post-								Other Post-
	Pension				Retirement				Pension				Retirement
	Plans				Plan				Plans				Plan
	(Dollars in millions)
Change in Projected Benefit Obligation:
Projected benefit obligation at beginning of year		$	1,452			$	183			$	1,257			$	180
Service cost		37				6				39				6
Interest cost		72				9				72				9
Plan participants’ contributions		—				2				—				2
Net actuarial loss (gain)		198				9				131				(1		)
Curtailment gain		—				—				(14		)		(5		)
Benefits paid		(35		)		(8		)		(33		)		(8		)
Projected benefit obligation at end of year		1,724				201				1,452				183
Change in Plan Assets:
Fair value of plan assets at beginning of year		1,042				—				942				—
Actual return on plan assets		136				—				2				—
Employer contributions		84				6				131				6
Plan participants’ contributions		—				2				—				2
Benefits paid		(35		)		(8		)		(33		)		(8		)
Fair value of plan assets at end of year		1,227				—				1,042				—
Funded status at end of year(1)		$	(497	)		$	(201	)		$	(410	)		$	(183	)

__________

⁽¹⁾  Included in other liabilities of our consolidated balance sheets as of December 31, 2012 and 2011.

Schedule of Assumptions Used [Table Text Block]

The following table displays the actuarial assumptions for our plans used in determining the net periodic benefit costs and the projected and accumulated benefit obligations as of December 31, 2012, 2011 and 2010.

	As of December 31,
	Pension Benefits						Postretirement Benefits
	2012		2011		2010		2012		2011		2010
Weighted-average assumptions used to determine net periodic benefit costs:
Discount rate	4.95	%	5.65	%	6.10	%	4.75	%	5.40	%	5.75	%
Average rate of increase in future compensation	4.00		4.00		4.00
Expected long-term weighted-average rate of return on plan assets	7.00		7.25		7.50
Weighted-average assumptions used to determine benefit obligation at year-end:
Discount rate	4.15	%	4.95	%	5.65	%	4.05	%	4.75	%	5.40	%
Average rate of increase in future compensation	4.00		4.00		4.00
Health care cost trend rate assumed for next year:
Pre-65							7.50	%	8.00	%	8.00	%
Post-65							7.50		8.00		8.00
Rate that cost trend rate gradually declines to and remains at:							5.00		5.00		5.00
Year that rate reaches the ultimate trend rate							2018		2018		2018

Qualified Pension Plan Assets by Asset Category at Their Fair Value [Table Text Block]

The following table displays our qualified pension plan assets by asset category at their fair value as of December 31, 2012 and 2011. The fair value of assets in Level 1 have been determined based on quoted prices of identical assets in active markets as of year end, while the fair value of assets in Level 2 have been determined based on the net asset value per share of the investments as of year end. None of the fair values for plan assets were determined by using significant unobservable inputs, or Level 3.

	Fair Value Measurement as of December 31,
	2012								2011
	Quoted Prices in Active Markets for Identical Assets (Level 1)			Significant Other Observable Inputs (Level 2)			Total		Quoted Prices in Active Markets for Identical Assets (Level 1)			Significant Other Observable Inputs (Level 2)			Total
	(Dollars in millions)
Cash equivalents		$	—		$	16	$	16		$	—		$	22	$	22
Equity securities:
U.S. large-cap(1)		405			—		405			353			—		353
U.S. mid/small cap(2)		105			—		105			91			—		91
International(3)		—			215		215			—			167		167
Fixed income securities:
Investment grade credit(4)		—			486		486			—			409		409
Total plan assets at fair value		$	510		$	717	$	1,227		$	444		$	598	$	1,042

__________

⁽¹⁾  Consists of a publicly traded equity index fund that tracks the S&P 500.

⁽²⁾  Consists of a publicly traded equity index fund that tracks all regularly traded U.S. stocks except those in the S&P 500.

⁽³⁾  Consists of an international equity fund that tracks an index of approximately 6,100 and 6,400 securities for 2012 and 2011, respectively, across over 40 countries. United Kingdom has the largest share with 15% and 16% in 2012 and 2011, respectively.

⁽⁴⁾  Consists of a bond fund that tracks a broadly diversified investment grade index that consists of approximately 3,600 and 3,000 issuances of investment grade bonds for 2012 and 2011, respectively, from diverse industries. International markets represent 19% and 20% of the fund in 2012 and 2011, respectively.

Schedule of Expected Benefit Payments [Table Text Block]

The following table displays the benefits we expect to pay in each of the next five years and in the aggregate for the subsequent five years for our pension plans and other postretirement plan and are based on the same assumptions used to measure our benefit obligation as of December 31, 2012.

	Expected Retirement Plan Benefit Payments
				Other Postretirement Benefits
	Pension Benefits			Before Medicare Part D Subsidy			Medicare Part D Subsidy
	(Dollars in millions)
2013		$	40		$	8		$	1
2014		44			8			1
2015		49			9			1
2016		54			9			1
2017		59			10			1
2018 — 2022		405			64			6