Income Taxes (Tables)

12 Months Ended

Dec. 31, 2016

Income Taxes [Abstract]

Reconciliation Of Provision For Income Taxes

	2016		2015		2014
Consolidated tax provision at federal statutory rate	35.0	%	35.0	%	35.0	%
State income tax provisions, net of federal income
tax benefit	(0.1)		8.7		1.6
Tax reserve adjustment	0.6		(0.3)		6.9
Domestic production activities deduction	(1.9)		-		(8.7)
Changes in certain deferred tax balances	5.8		0.8		(14.1)
Federal research and development credit	1.0		1.5		(3.3)
Non-deductible transaction costs	-		0.4		1.0
All other, net	(0.2)		(0.3)		0.3
Effective tax rate	40.2	%	45.8	%	18.7	%

Components of Net Deferred Income Tax Liability (Asset)

($ in millions)	2016		2015
Deferred income tax liabilities:
Property, plant and equipment basis differences	$	2,751	$	2,401
Intangibles		878		960
Deferred revenue/expense		14		-
Other, net		12		15
	$	3,655	$	3,376
Deferred income tax assets:
Pension liability		273		222
Tax operating loss carryforward		687		295
Employee benefits		255		262
Accrued expenses		44		50
Lease obligations		75		-
Tax credit		30		-
Allowance for doubtful accounts		44		10
Other, net		2		48
		1,410		887
Less: Valuation allowance		(271)		(177)
Net deferred income tax asset		1,139		710
Net deferred income tax liability	$	2,516	$	2,666

Schedule of Components of Income Tax Expense (Benefit)

($ in millions)	2016		2015		2014
Income tax expense (benefit):
Current:
Federal	$	(52)	$	8	$	98
State		7		(6)		10
Total Current		(45)		2		108
Deferred:
Federal		(145)		(126)		(34)
State		(60)		(41)		(44)
Total Deferred		(205)		(167)		(78)
Total income tax expense (benefit)		(250)		(165)		30
Income taxes charged (credited) to equity of Frontier:
Utilization of the benefits arising from restricted stock		(5)		-		-
Deferred income taxes (benefits) arising from the recognition
of additional pension/OPEB liability		(21)		36		(90)
Total income taxes charged (credited) to equity of Frontier		(26)		36		(90)
Total income taxes	$	(276)	$	(129)	$	(60)

Changes in the Balance of Unrecognized Tax Benefits

($ in millions)	2016		2015
Unrecognized tax benefits - beginning of year	$	19	$	19
Gross increases - prior year tax positions		3		-
Gross increases - current year tax positions		3		2
Gross decreases - FIN 48 liability release		(9)		-
Gross decreases - expired statute of limitations		-		(2)
Unrecognized tax benefits - end of year	$	16	$	19