Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2014

Benefit Plans

Significant Actuarial Assumptions Used to Determine Net Periodic Pension Costs

	December 31,
	2014		2013		2012
Weighted average assumed discount rate	5.10	%	4.25	%	4.82	%
Weighted average expected long-term rate of return on plan assets	7.75		8.00		8.00
Assumed long-term rate of annual compensation increases	5.00		4.50		4.50

Summary of the Components of Net Periodic Benefit Cost Recognized for Pension Plans

					Year Ended December 31,
					2014		2013		2012
					(Dollars in millions)
Net Periodic Pension Cost:
	Service cost				$	138	$	150	$	120
	Interest cost					140		120		110
	Estimated return on plan assets					(296)		(257)		(200)
	Net amortization and other					17		91		76
		Net periodic benefit cost				(1)		104		106
Pre-Tax Amounts Recognized in OCI:
	Net actuarial loss (gain)					532		(535)		270
	Net amortization					(17)		(91)		(76)
		Net amount recognized in OCI				515		(626)		194
			Total net periodic pension costs (income) recognized in
				total comprehensive income, pre-tax	$	514	$	(522)	$	300

Significant Actuarial Assumptions Used to Determine Benefit Obligations

	December 31,
	2014		2013
Weighted average assumed discount rate	4.27	%	5.10	%
Assumed rate of annual compensation increases	4.50		5.00

Changes in Projected Benefit Obligation

		Qualified Pension Plan				Nonqualified Pension Plans
		Year Ended December 31,				Year Ended December 31,
		2014		2013		2014		2013
		(Dollars in millions)
Projected benefit obligation, beginning of year		$	2,437	$	2,548	$	304	$	287
	Service cost		128		139		10		11
	Interest cost		124		107		16		12
	Actuarial (gain) loss		607		(294)		45		2
	Benefits paid		(69)		(63)		(8)		(8)
Projected benefit obligation, end of year		$	3,227	$	2,437	$	367	$	304
Accumulated benefit obligation, end of year		$	2,744	$	2,062	$	295	$	215

Changes in Fair Value of Plan Assets

		Qualified Pension Plan				Nonqualified Pension Plans
		Year Ended December 31,				Year Ended December 31,
		2014		2013		2014		2013
		(Dollars in millions)
Fair value of plan assets, beginning of year		$	3,733	$	2,952	$	—	$	—
	Actual return on plan assets		416		499		—		—
	Employer contributions		143		345		8		8
	Benefits paid		(69)		(63)		(8)		(8)
Fair value of plan assets, end of year		$	4,223	$	3,733	$	—	$	—
Funded status at end of year		$	996	$	1,296	$	(367)	$	(304)

Schedule of Pre-tax Amounts Recognized in AOCI

		Qualified Pension Plan				Nonqualified Pension Plans
		Year Ended December 31,				Year Ended December 31,
		2014		2013		2014		2013
		(Dollars in millions)
Prior service credit (cost)		$	-	$	-	$	(2)	$	(2)
Net actuarial loss			(859)		(377)		(149)		(117)
	Net amount recognized	$	(859)	$	(377)	$	(151)	$	(119)

Schedule of Prior Period Amounts Expected to be Amortized from AOCI Into Net Periodic Pension Cost During Next Fiscal Year

		Qualified		Nonqualified
		Pension Plan		Pension Plans
		(Dollars in millions)
Net actuarial gain (loss)		$	(47)	$	(14)
	Net amount expected to be amortized in 2015	$	(47)	$	(14)

Schedule of Estimated Future Benefit Payments

	Qualified		Nonqualified
	Pension Plan		Pension Plans
	(Dollars in millions)
2015	$	76	$	11
2016		84		12
2017		93		13
2018		102		14
2019		111		15
2020-2024		719		93

Schedule of Fair Value of Pension Plan Assets by Three Level Fair Value Hierarchy

		December 31, 2014								December 31, 2013
		Total		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3
		(Dollars in millions)
Cash and cash-equivalents		$	66	$	66	$	—	$	—	$	74	$	74	$	—	$	—
U.S. equity securities			1,635		1,635		—		—		1,701		1,701		—		—
International equity securities			657		539		118		—		741		626		115		—
Fixed income securities			1,717		10		1,707		—		1,090		94		996		—
Alternative investments			124		—		—		124		101		—		—		101
	Total plan assets	$	4,199	$	2,250	$	1,825	$	124	$	3,707	$	2,495	$	1,111	$	101

Activity of Plan Assets with Significant Unobservable Fair Value Inputs

		Year Ended December 31,
		2014		2013		2012
		(Dollars in millions)
Balance at beginning of year		$	101	$	98	$	99
	Actual return on plan assets		11		11		7
	Purchases, sales and settlements		12		(8)		(8)
Balance at end of year		$	124	$	101	$	98