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Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2020
Comprehensive Loss [Abstract]  
Accumulated Other Comprehensive Income (Loss), Net Of Tax

($ in millions)

Pension Costs

OPEB Costs

Total

Balance at December 31, 2017 (1)

$

(345)

$

(21)

$

(366)

Other comprehensive income (loss) before

reclassifications

(191)

51 

(140)

Amounts reclassified from accumulated

other comprehensive income (loss)

47 

(4)

43 

Net current-period other comprehensive income (loss)

(144)

47 

(97)

Balance at December 31, 2018 (1)

(489)

26 

(463)

Other comprehensive income (loss) before

reclassifications

(201)

17 

(184)

Amounts reclassified from accumulated

other comprehensive income (loss)

89 

(13)

76 

Net current-period other comprehensive income (loss)

(112)

4 

(108)

Impact of adoption of ASU 2018-02

(83)

4 

(79)

Balance at December 31, 2019 (1)

(684)

$

34 

$

(650)

Other comprehensive income (loss) before

reclassifications

(320)

(76)

(396)

Amounts reclassified from accumulated

other comprehensive income (loss)

305 

(14)

291 

Net current-period other comprehensive income (loss)

(15)

(90)

(105)

Balance at December 31, 2020 (1)

$

(699)

$

(56)

$

(755)

(1)Pension and OPEB amounts are net of deferred tax balances of $234 million, $204 million, $250 million and $223 million as of December 31, 2020, 2019, 2018, and 2017, respectively.
Reclassification Out Of AOCI

Amount Reclassified from

($ in millions)

Accumulated Other Comprehensive Loss (1)

Affected Line Item in the

Details about Accumulated Other

Statement where

Comprehensive Loss Components

2020

2019

2018

Net loss is Presented

Amortization of Pension Cost Items (2)

Actuarial gains (losses)

$

(99)

$

(58)

$

(24)

Loss on disposal

(81)

-

-

Pension settlement costs

(159)

(57)

(41)

Reclassifications, pretax

(339)

(115)

(65)

Loss before income taxes

Tax Impact

34 

26 

18 

Income tax (expense) benefit

Reclassifications, net of tax

$

(305)

$

(89)

$

(47)

Net loss

Amortization of OPEB Cost Items (2)

Prior-service credits (costs)

$

32 

$

11 

$

9 

Actuarial gains (losses)

(6)

4 

(3)

Loss on disposal

(7)

-

-

Reclassifications, pretax

19 

15 

6 

Loss before income taxes

Tax impact

(5)

(2)

(2)

Income tax (expense) benefit

Reclassifications, net of tax

$

14 

$

13 

$

4 

Net loss

(1)Amounts in parentheses indicate losses.

(2)These accumulated other comprehensive loss components are included in the computation of net periodic pension and OPEB costs (see Note 20 - Retirement Plans for additional details).