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Retirement Plans (Tables)
12 Months Ended
Dec. 31, 2021
Retirement Plans [Abstract]  
Projected Benefit Obligation, Fair Values Of Plan Assets And Amounts Recognized In The Balance Sheet Successor Predecessor For the eight For the four For the months ended months ended year ended December 31, April 30, December 31, ($ in millions) 2021 2021 2020 Change in projected benefit obligation (PBO) PBO at the beginning of the period $ 3,418  $ 3,708  $ 3,726  Service cost 53  32  95  Interest cost 69  31  108  Actuarial (gain) loss 30  (328) 506  Benefits paid (93) (25) (73) Impact of Divestiture of Northwest Operations(1) - - (189) Settlements - - (465) PBO at the end of the period $ 3,477  $ 3,418  $ 3,708  Change in plan assets Fair value of plan assets at the beginning of the period $ 2,586  $ 2,507  $ 2,730  Fair value of plan assets for the Northwest Operations - - (70) Actual return on plan assets 152  72  321  Employer contributions 10  32  64  Settlements - - (465) Benefits paid (93) (25) (73) Fair value of plan assets at the end of the period $ 2,655  $ 2,586  $ 2,507  Funded status $ (822) $ (832) $ (1,201) Amounts recognized in the consolidated balance sheet Pension and other postretirement benefits - current $ - $ - $ - Pension and other postretirement benefits - noncurrent $ (822) $ (832) $ (1,201) Accumulated other comprehensive loss $ - $ - $ 915  (1) Includes a gain of $20 million related to the elimination of future compensation increases as a result of the divestiture of the Northwest Operations.
Net Periodic Benefit Cost Successor Predecessor For the eight For the four For the year For the year months ended months ended ended ended December 31, April 30, December 31, December 31, ($ in millions) 2021 2021 2020 2019 Components of total pension benefit cost Service cost $53 $32 $95 $82 Interest cost on projected benefit obligation 69 31 108 130 Expected return on plan assets (127) (61) (171) (172) Loss recognized 6 - - - Amortization of unrecognized loss - 24 99 58 Net periodic pension benefit cost 1 26 131 98 Pension settlement costs - - 159 57 Special termination benefit enhancements - - - 38 Gain on disposal, net - - (38) - Total pension benefit cost $1 $26 $252 $193
Weighted Average Asset Allocations, By Asset Category 2021 2020 Asset category: Equity securities 49 % 49 % Debt securities 44 % 37 % Alternative and other investments 7 % 14 % Total 100 % 100 %
Expected Benefit Payments Over The Next Ten Years ($ in millions) Amount      2022 $ 257  2023 254  2024 252  2025 252  2026 250  2027-2031 1,181  Total $ 2,446 
Schedule Of Assumptions Used 12/31/2021 4/30/2021 12/31/2020 12/31/2019 Discount rate - used at period end to value obligation 2.90 % 3.10% 2.60 % 3.40 % Discount rate - used at beginning of period to compute annual cost 3.10 % 2.60 % 3.40 % 4.30 % Expected long-term rate of return on plan assets 7.50 % 7.50 % 7.50 % 7.50 % Rate of increase in compensation levels 2.00 % 2.00 % 2.00 % 2.00 %
Schedule Of Changes In Projected Benefit Obligations For OPEB Successor Predecessor For the eight For the four For the year months ended months ended ended December 31, April 30, December 31, ($ in millions) 2021 2021 2020 Change in benefit obligation Benefit obligation at the beginning of the period $ 941  $ 1,042  $ 972  Impact of Divestiture of Northwest Operations - - (31) Service cost 11  7  20  Interest cost 18  9  33  Plan amendments (79) - - Plan participants' contributions 6  4  9  Actuarial (gain) loss 37  (99) 100  Benefits paid (37) (22) (61) Special termination benefits - - - Benefit obligation at the end of the period $ 897  $ 941  $ 1,042  Change in plan assets Fair value of plan assets at the beginning of the period $ - $ - $ - Plan participants' contributions 6  4  9  Employer contribution 31  18  52  Benefits paid (37) (22) (61) Fair value of the plan assets at end of the period $ - $ - $ - Funded status $ (897) $ (941) $ (1,042) Amounts recognized in the consolidated balance sheet Pension and other postretirement benefits - current $ (46) $ (48) $ (48) Pension and other postretirement benefits - noncurrent $ (851) $ (893) $ (994) Accumulated other comprehensive (gain) loss $ (75) $ - $ 74 
Schedule Of Net Benefit Costs For OPEB Successor Predecessor For the eight For the four For the year For the year months ended months ended ended ended December 31, April 30, December 31, December 31, ($ in millions) 2021 2021 2020 2019 Components of total postretirement benefit cost Service cost $ 11  $ 7  $ 20  $ 20  Interest cost on projected benefit obligation 18  9  33  41  Amortization of prior service credit (5) (10) (32) (11) (Gain) loss recognized 37  - - - Amortization of unrecognized (gain) loss - 5  6  (4) Net periodic postretirement benefit cost 61  11  27  46  Special termination benefit enhancements - - - 6  Gain on disposal, net - - (24) - Total postretirement benefit cost $ 61  $ 11  $ 3  $ 52 
Schedule Of Assumptions Used For OPEB 12/31/2021 4/30/2021 12/31/2020 12/31/2019 Discount rate - used at period end to value obligation 3.00% 3.30% 2.60% - 2.80% 3.40% - 3.50% Discount rate - used to compute annual cost 2.80% - 3.30% 2.60% - 2.80% 3.40% - 3.50% 4.30% - 4.40%
Schedule Of Expected Benefit Payments For OPEB ($ in millions) Gross Benefit Medicare Part D Subsidy Total      2022 $ 47  $ - $ 47  2023 44  - 44  2024 46  - 46  2025 45  - 45  2026 48  - 48  2027-2031 254  2  256  Total $ 484  $ 2  $ 486 
Net Periodic Benefit Cost Not Yet Recognized Pension Plan OPEB (Successor) (Predecessor) (Successor) (Predecessor) ($ in millions) 2021 2020 2021 2020 Net actuarial loss $ - $ 915  $ - $ 192  Prior service credit - - (75) (118) Total $ - $ 915  $ (75) $ 74 
Amounts Recognized As A Component Of AOCI Successor Predecessor For the eight For the four For the year months ended months ended ended Pension Plan December 31, April 30, December 31, ($ in millions) 2021 2021 2020 Accumulated other comprehensive (gain) loss at the beginning of the period $ - $ 915  $ 899  Net actuarial gain (loss) amortized during the period - (24) (99) Net loss on disposal recognized during the period - - (81) Prior service credit amortized during the period - - - Prior service credit occurring during the period - - - Net actuarial (gain) loss occurring during the period - (338) 355  Impact of fresh start accounting - (553) - Settlement loss recognized - - (159) Net amount recognized in comprehensive income (loss) for the period - (915) 16  Accumulated other comprehensive (gain) loss at end of the period $ - $ - $ 915  Successor Predecessor For the eight For the four For the year months ended months ended ended OPEB December 31, April 30, December 31, ($ in millions) 2021 2021 2020 Accumulated other comprehensive (gain) loss at the beginning of the period $ - $ 74  $ (45) Net actuarial gain (loss) recognized during the period - (5) (6) Net loss on disposal recognized during the period - - (7) Prior service credit amortized during the period 5  10  32  Impact of fresh start accounting - 20  - Prior service credit occurring during the period (80) - - Net actuarial (gain) loss occurring during the period - (99) 100  Settlement loss recognized - - - Net amount recognized in comprehensive income (loss) for the period (75) (74) 119  Accumulated other comprehensive (gain) loss at end of the period $ (75) $ - $ 74