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Fair Value Of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2023

Fair Value Of Financial Instruments [Abstract]

Pension Plan Assets Measured At Fair Value On Recurring Basis



	Fair Value Measurements at December 31, 2023
($ in millions)	Total		Level 1		Level 2		Level 3
Cash and Cash Equivalents	$	128	$	128	$	-	$	-
Government Obligations		300		-		300		-
Corporate and Other Obligations		160		-		160		-
Equities		90		90		-		-
Interest in Limited Partnerships and
Limited Liability Companies		162		-		-		162
Commingled Funds		1,310				1,310
Total investments at fair value	$	2,150	$	218	$	1,770	$	162
Interest in Registered Investment Companies ⁽¹⁾		54
Interest in Limited Partnerships and
Limited Liability Companies ⁽¹⁾		81
Interest and Dividend Receivable		5
Due from Broker for Securities Sold		11
Value of Funds Held in Insurance Co.		5
Due to Broker for Securities Purchased		(38)
Total Plan Assets, at Fair Value	$	2,268



	Fair Value Measurements at December 31, 2022
($ in millions)	Total		Level 1		Level 2		Level 3
Cash and Cash Equivalents	$	67	$	67	$	-	$	-
Government Obligations		62		-		62		-
Corporate and Other Obligations		289		-		289		-
Equities		136		136		-		-
Interest in Registered Investment Companies ⁽¹⁾		48		48		-		-
Interest in Limited Partnerships and
Limited Liability Companies		156		-		-		156
Total investments at fair value	$	758	$	251	$	351	$	156
Commingled Funds (1)		1,252
Interest and Dividend Receivable		4
Due from Broker for Securities Sold		54
Value of Funds Held in Insurance Co.		5
Due to Broker for Securities Purchased		(40)
Total Plan Assets, at Fair Value	$	2,033

(1)In accordance with Subtopic 820-10, certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. These balances are intended to permit reconciliation of the fair value hierarchy to the plan asset amounts presented in Note 19 - Retirement Plans.

Changes In Fair Value of Plan's Level 3 Assets



	Interest in Limited Partnerships and Limited Liability Companies
($ in millions)	2023		2022
Balance at beginning of year	$	156	$	165
Realized gains		13		14
Unrealized gains		6		(9)
Purchases		-		-
Sales and distributions		(13)		(14)
Balance at end of year	$	162	$	156

Redemption Of The Plan's Level 3 Investments




			Liquidation		Capitalization
($ in millions)	Fair Value		Period		Rate
Interest in Limited Partnerships and Limited Liability Companies ⁽²⁾

426 E. Casino Road, LLC ⁽¹⁾	$	18		N/A		7.00%
100 Comm Drive, LLC ⁽¹⁾		10		N/A		8.25%
100 CTE Drive, LLC ⁽¹⁾		12		N/A		9.75%
6430 Oakbrook Parkway, LLC ⁽¹⁾		28		N/A		7.50%
8001 West Jefferson, LLC ⁽¹⁾		24		N/A		9.00%
1500 MacCorkle Ave SE, LLC ⁽¹⁾		14		N/A		9.25%
400 S. Pike Road West, LLC ⁽¹⁾		1		N/A		9.00%
601 N. US 131, LLC ⁽¹⁾		1		N/A		9.50%
9260 E. Stockton Blvd., LLC ⁽¹⁾		7		N/A		7.75%
120 E. Lime Street, LLC ⁽¹⁾		10		N/A		9.00%
610 N. Morgan Street, LLC ⁽¹⁾		37		N/A		8.50%
Total Interest in Limited Partnerships and Limited Liability Companies	$	162

⁽¹⁾The entity invests in commercial real estate properties that are leased to Frontier. The leases are triple net, whereby we are responsible for all expenses, including but not limited to, insurance, repairs and maintenance and payment of property taxes.

⁽²⁾All Level 3 investments have the same redemption frequency (through the liquidation of underlying investments) and redemption notice period (none). The fair value of these properties is based on independent appraisals.

Fair Value Of Long-Term Debt



	2023				2022
		Carrying				Carrying
($ in millions)		Amount		Fair Value		Amount		Fair Value

Total debt	$	11,231	$	10,712	$	8,963	$	8,079