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Fair Value Of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2019
Fair Value Of Financial Instruments [Abstract]  
Pension Plan Assets Measured At Fair Value on Recurring Basis

 
Fair Value Measurements at December 31, 2019
 
($ in millions)
 
Total
   
Level 1
   
Level 2
   
Level 3
 
Cash and Cash Equivalents
 
$
46
   
$
46
   
$
-
   
$
-
 
U.S. Government Obligations
   
39
     
-
     
39
     
-
 
Corporate and Other Obligations
   
547
     
-
     
547
     
-
 
Common Stock
   
552
     
552
     
-
     
-
 
Preferred Stock
   
4
     
4
     
-
     
-
 
Interest in Registered Investment Companies (1)
   
150
     
150
     
-
     
-
 
Interest in Limited Partnerships and Limited Liability Companies
   
163
     
-
     
-
     
163
 
Total investments at fair value
 
$
1,501
   
$
752
   
$
586
   
$
163
 
Common/Collective Trusts (1)
   
1,177
                         
Interest in Registered Investment Companies (1)
   
87
                         
Interest and Dividend Receivable
   
6
                         
Due from Broker for Securities Sold
   
61
                         
Receivable Associated with Insurance Contract
   
7
                         
Due to Broker for Securities Purchased
   
(109
)
                       
Total Plan Assets, at Fair Value
 
$
2,730
                         


 
Fair Value Measurements at December 31, 2018
 
($ in millions)
 
Total
   
Level 1
   
Level 2
   
Level 3
 
Cash and Cash Equivalents
 
$
36
   
$
36
   
$
-
   
$
-
 
U.S. Government Obligations
   
46
     
-
     
46
     
-
 
Corporate and Other Obligations
   
425
     
-
     
425
     
-
 
Common Stock
   
420
     
420
     
-
     
-
 
Interest in Registered Investment Companies (1)
   
262
     
262
     
-
     
-
 
Interest in Limited Partnerships and Limited Liability Companies
   
155
     
-
     
-
     
155
 
Total investments at fair value
 
$
1,344
   
$
718
   
$
471
   
$
155
 
Common/Collective Trusts (1)
   
1,031
                         
Interest and Dividend Receivable
   
6
                         
Due from Broker for Securities Sold
   
20
                         
Receivable Associated with Insurance Contract
   
7
                         
Due to Broker for Securities Purchased
   
(60
)
                       
Total Plan Assets, at Fair Value
 
$
2,348
                         

(1)
Investments that are measured at fair value using the net asset value (“NAV”) practical expedient have not been classified in the fair value hierarchy. The fair value of common/collective trusts are estimated using the using the NAV per share multiplied by the number of shares of the trust investment held as of the measurement date. Additionally, the fair value of certain assets totaling $87 million and $131 million, as of December 31, 2019 and 2018, respectively, included in “Interest in Registered Investment Companies” were estimated using the NAV practical expedient. These balances are intended to permit reconciliation of the fair value hierarchy to the plan asset amounts presented in Note 20 - Retirement Plans.
Changes In Fair Value of Plan's Level 3 Assets

 
Interest in Limited Partnerships and Limited Liability Companies
 
($ in millions)
 
2019
   
2018
 
Balance at beginning of year
 
$
155
   
$
115
 
Realized gains
   
14
     
11
 
Unrealized gains (losses)
   
8
     
3
 
Purchases
   
-
     
37
 
Sales and distributions
   
(14
)
   
(11
)
Balance at end of year
 
$
163
   
$
155
 
Redemption Of The Plan's Level 3 Investments
($ in millions)
 
Fair Value
   
Liquidation
Period
   
Capitalization
Rate
 
Interest in Limited Partnerships and Limited Liability Companies (4)
                 
                   
MS IFHF SVP LP Cayman (1)
 
$
1
   
5 years
     
N/A
 
RII World Timberfund, LLC (2)
   
5
   
2 years
     
N/A
 
426 E. Casino Road, LLC (3)
   
16
     
N/A
     
7.00
%
100 Comm Drive, LLC (3)
   
10
     
N/A
     
7.75
%
100 CTE Drive, LLC (3)
   
11
     
N/A
     
9.5% - 10.0
%
6430 Oakbrook Parkway, LLC (3)
   
27
     
N/A
     
7.75
%
8001 West Jefferson, LLC (3)
   
28
     
N/A
     
8.75
%
1500 MacCorkle Ave SE, LLC (3)
   
15
     
N/A
     
8.50
%
400 S. Pike Road West, LLC (3)
   
1
     
N/A
     
8.50
%
601 N. US 131, LLC (3)
   
1
     
N/A
     
9.50
%
9260 E. Stockton Blvd., LLC (3)
   
6
     
N/A
     
7.25
%
120 E. Lime Street, LLC (3)
   
9
     
N/A
     
9.00
%
610 N. Morgan Street, LLC (3)
   
33
     
N/A
     
8.50
%
Total Interest in Limited Partnerships and Limited
                       
Liability Companies
 
$
163
                 


(1)
The partnerships’ investment objective is to seek capital appreciation principally through investing in investment funds managed by third party investment managers who employ a variety of alternative investment strategies. These instruments are subject to certain withdrawal restrictions. The Plan is in the process of liquidating its interest in the partnerships and distributions are expected to be made over the next five years.
(2)
The fund’s objective is to realize substantial long-term capital appreciation by investing in timberland properties primarily in South America and Australia. This investment is subject to certain withdrawal restrictions. In 2019, the fund entered into liquidation period of the partnerships and distributions are expected to be made over the next two years.
(3)
The entity invests in commercial real estate properties that are leased to Frontier. The leases are triple net, whereby Frontier is responsible for all expenses, including but not limited to, insurance, repairs and maintenance and payment of property taxes.
(4)
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

 
2019
   
2018
 
($ in millions)
 
Carrying
Amount
   
Fair Value
   
Carrying
Amount
   
Fair Value
 
                         
Total debt
 
$
17,516
   
$
12,026
   
$
17,400
   
$
12,756