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Employee Benefits (Tables) | 12 Months Ended
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Dec. 31, 2022
Retirement Benefits [Abstract] |
Schedule of estimated future benefit payments | The estimated benefit payments provided below are based on actuarial assumptions using the demographics of the employee and retiree populations and have been reduced by estimated participant contributions.
| Combined Pension Plan |  | Post-Retirement Benefit Plans |  | Medicare Part D Subsidy Receipts
| (Dollars in millions)
Estimated future benefit payments: |  |  |  |  |
2023 | $ | 566 |  |  | 213 |  |  | (3) |
2024 | 514 |  |  | 205 |  |  | (3) |
2025 | 500 |  |  | 198 |  |  | (2) |
2026 | 482 |  |  | 191 |  |  | (2) |
2027 | 463 |  |  | 184 |  |  | (2) |
2028 - 2032 | 2,065 |  |  | 805 |  |  | (7) |
Schedule of actuarial assumptions used to compute net periodic benefit expense | The actuarial assumptions used to compute the net periodic benefit expense for our Combined Pension Plan and post-retirement benefit plans are based upon information available as of the beginning of the year, as presented in the following table.
| Combined Pension Plan |  | Post-Retirement Benefit Plans
| 2022 |  | 2021 |  | 2020 |  | 2022 |  | 2021 |  | 2020
Actuarial assumptions at beginning of year: |  |  |  |  |  |  |  |  |  |  |
Discount rate | 2.29% - 3.12% |  | 1.70% - 2.88% |  | 2.79% - 3.55% |  | 2.19% - 5.78% |  | 1.58% - 2.60% |  | 1.69% - 3.35%
Rate of compensation increase | 3.25 | % |  | 3.25 | % |  | 3.25 | % |  | N/A |  | N/A |  | N/A
Expected long-term rate of return on plan assets(1) | 5.50 | % |  | 5.50 | % |  | 6.50 | % |  | 4.00 | % |  | 4.00 | % |  | 4.00 | %
Initial health care cost trend rate | N/A |  | N/A |  | N/A |  | 5.00% / 5.75% |  | 6.25% / 5.00% |  | 6.50% / 5.00%
Ultimate health care cost trend rate | N/A |  | N/A |  | N/A |  | 4.50 | % |  | 4.50 | % |  | 4.50 | %
Year ultimate trend rate is reached | N/A |  | N/A |  | N/A |  | 2025 |  | 2025 |  | 2025
_______________________________________________________________________________ N/A - Not applicable (1)Rates are presented net of projected fees and administrative costs.
Schedule of components of net periodic pension income and post-retirement benefit expense | Net periodic benefit expense (income) for our Combined Pension Plan and the Lumen Pension Plan (together the "Pension Plans") includes the following components:
| Pension Plans Years Ended December 31,
| 2022 |  | 2021 |  | 2020
| (Dollars in millions)
Service cost | $ | 44 |  |  | 56 |  |  | 59 |
Interest cost | 194 |  |  | 201 |  |  | 324 |
Expected return on plan assets | (385) |  |  | (535) |  |  | (593) |
Settlement charges | — |  |  | 383 |  |  | — |
Realized to gain on sale of businesses | 546 |  |  | — |  |  | — |
Special termination benefits charge | — |  |  | 6 |  |  | 13 |
Recognition of prior service credit | (10) |  |  | (9) |  |  | (9) |
Recognition of actuarial loss | 122 |  |  | 184 |  |  | 202 |
Net periodic pension expense (income) | $ | 511 |  |  | 286 |  |  | (4) |
Net periodic benefit expense for our post-retirement benefit plans includes the following components:
| Post-Retirement Plans Years Ended December 31,
| 2022 |  | 2021 |  | 2020
| (Dollars in millions)
Service cost | $ | 10 |  |  | 14 |  |  | 14 |
Interest cost | 72 |  |  | 47 |  |  | 69 |
Expected return on plan assets | — |  |  | — |  |  | (1) |
Realized to gain on sale of businesses | (32) |  |  | — |  |  | — |
Recognition of prior service cost | 8 |  |  | 15 |  |  | 16 |
Recognition of actuarial loss | (4) |  |  | 4 |  |  | — |
Curtailment loss | — |  |  | — |  |  | 8 |
Net periodic post-retirement benefit expense | $ | 54 |  |  | 80 |  |  | 106 |
Schedule of actuarial assumptions used to compute the funded status for the plans | The actuarial assumptions used to compute the funded status for the plans are based upon information available as of December 31, 2022 and 2021 and are as follows:
| Combined Pension Plan |  | Post-Retirement Benefit Plans
| December 31, |  | December 31,
| 2022 |  | 2021 |  | 2022 |  | 2021
Actuarial assumptions at end of year: |  |  |  |  |  |  |
Discount rate | 5.56 | % |  | 2.85 | % |  | 5.55 | % |  | 2.84 | %
Rate of compensation increase | 3.25 | % |  | 3.25 | % |  | N/A |  | N/A
Initial health care cost trend rate | N/A |  | N/A |  | 7.20% / 5.00% |  | 5.75% / 5.00%
Ultimate health care cost trend rate | N/A |  | N/A |  | 4.50 | % |  | 4.50 | %
Year ultimate trend rate is reached | N/A |  | N/A |  | 2030 |  | 2025
_______________________________________________________________________________ N/A - Not applicable
Schedule of change in benefit obligation | The following tables summarize the change in the benefit obligations for the Combined Pension Plan and post-retirement benefit plans:
| Combined Pension Plan Years Ended December 31,
| 2022 |  | 2021 |  | 2020
| (Dollars in millions)
Change in benefit obligation |  |  |  |  |
Benefit obligation at beginning of year | $ | 9,678 |  |  | 12,202 |  |  | 12,217 |
Plan spin-off | (2,552) |  |  | — |  |  | — |
Service cost | 37 |  |  | 56 |  |  | 59 |
Interest cost | 154 |  |  | 201 |  |  | 324 |
Plan amendments | — |  |  | (13) |  |  | (3) |
Special termination benefits charge | — |  |  | 6 |  |  | 13 |
Actuarial (gain) loss | (1,432) |  |  | (337) |  |  | 749 |
Benefits paid from plan assets | (590) |  |  | (766) |  |  | (1,157) |
Settlement payments and annuity purchase | — |  |  | (1,671) |  |  | — |
Benefit obligation at end of year | $ | 5,295 |  |  | 9,678 |  |  | 12,202 |
| Post-Retirement Benefit Plans Years Ended December 31,
| 2022 |  | 2021 |  | 2020
| (Dollars in millions)
Change in benefit obligation |  |  |  |  |
Benefit obligation at beginning of year | $ | 2,781 |  |  | 3,048 |  |  | 3,037 |
Benefit obligation transferred to purchaser upon sale of business | (26) |  |  | — |  |  | — |
Service cost | 10 |  |  | 14 |  |  | 14 |
Interest cost | 72 |  |  | 47 |  |  | 69 |
Participant contributions | 37 |  |  | 41 |  |  | 46 |
Direct subsidy receipts | 2 |  |  | 3 |  |  | 6 |
Plan amendments | (41) |  |  | — |  |  | — |
Actuarial (gain) loss | (591) |  |  | (125) |  |  | 134 |
Curtailment loss | — |  |  | — |  |  | 4 |
Benefits paid by company | (249) |  |  | (247) |  |  | (255) |
Benefits paid from plan assets | — |  |  | — |  |  | (7) |
Benefit obligation at end of year | $ | 1,995 |  |  | 2,781 |  |  | 3,048 |
Schedule of change in plan assets | The following table summarizes the change in the fair value of plan assets for the Combined Pension Plan:
| Combined Pension Plan Years Ended December 31,
| 2022 |  | 2021 |  | 2020
| (Dollars in millions)
Change in plan assets |  |  |  |  |
Fair value of plan assets at beginning of year | $ | 8,531 |  |  | 10,546 |  |  | 10,493 |
Plan spin-off | (2,239) |  |  | — |  |  | — |
Return on plan assets | (987) |  |  | 422 |  |  | 1,210 |
Benefits paid from plan assets | (590) |  |  | (766) |  |  | (1,157) |
Settlement payments and annuity purchase | — |  |  | (1,671) |  |  | — |
Fair value of plan assets at end of year | $ | 4,715 |  |  | 8,531 |  |  | 10,546 |
Schedule of fair value of the plans' assets by asset category | The table below presents the fair value of plan assets by category and the input levels used to determine those fair values at December 31, 2022. It is important to note that the asset allocations do not include market exposures that are gained with derivatives. Investments include dividend and interest receivables, pending trades and accrued expenses.
| Fair Value of Combined Pension Plan Assets at December 31, 2022
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (Dollars in millions)
Assets |  |  |  |  |  |  |
Investment grade bonds (a) | $ | 446 |  |  | 1,720 |  |  | — |  |  | 2,166 |
High yield bonds (b) | — |  |  | 48 |  |  | 4 |  |  | 52 |
Emerging market bonds (c) | 49 |  |  | 78 |  |  | — |  |  | 127 |
U.S. stocks (d) | 214 |  |  | — |  |  | 1 |  |  | 215 |
Non-U.S. stocks (e) | 149 |  |  | 1 |  |  | — |  |  | 150 |
Multi-asset strategies (l) | 25 |  |  | — |  |  | — |  |  | 25 |
Cash equivalents and short-term investments (o) | — |  |  | 1 |  |  | — |  |  | 1 |
Total investments, excluding investments valued at NAV | $ | 883 |  |  | 1,848 |  |  | 5 |  |  | 2,736 |
Liabilities |  |  |  |  |  |  |
Repurchase agreements (n) | $ | — |  |  | (269) |  |  | — |  |  | (269) |
Derivatives (m) | (1) |  |  | (10) |  |  | — |  |  | (11) |
Investments valued at NAV |  |  |  |  |  |  | 2,259 |
Total pension plan assets |  |  |  |  |  |  | $ | 4,715 |
The table below presents the fair value of plan assets by category and the input levels used to determine those fair values at December 31, 2021. It is important to note that the asset allocations do not include market exposures that are gained with derivatives. Investments include dividend and interest receivable, pending trades and accrued expenses.
| Fair Value of Combined Pension Plan Assets at December 31, 2021
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (Dollars in millions)
Assets |  |  |  |  |  |  |
Investment grade bonds (a) | $ | 862 |  |  | 3,744 |  |  | — |  |  | 4,606 |
High yield bonds (b) | — |  |  | 172 |  |  | 6 |  |  | 178 |
Emerging market bonds (c) | 64 |  |  | 169 |  |  | — |  |  | 233 |
U.S. stocks (d) | 330 |  |  | 3 |  |  | 5 |  |  | 338 |
Non-U.S. stocks (e) | 256 |  |  | — |  |  | — |  |  | 256 |
Multi-asset strategies (l) | 41 |  |  | — |  |  | — |  |  | 41 |
Derivatives (m) | — |  |  | 1 |  |  | — |  |  | 1 |
Cash equivalents and short-term investments (o) | 2 |  |  | 379 |  |  | — |  |  | 381 |
Total investments, excluding investments valued at NAV | $ | 1,555 |  |  | 4,468 |  |  | 11 |  |  | 6,034 |
Liabilities |  |  |  |  |  |  |
Repurchase agreements (n) | $ | — |  |  | (193) |  |  | — |  |  | (193) |
Investments valued at NAV |  |  |  |  |  |  | 2,690 |
Total pension plan assets |  |  |  |  |  |  | $ | 8,531 |
The table below presents the fair value of plan assets valued at NAV by category for our Combined Pension Plan at December 31, 2022 and 2021.
| Fair Value of Plan Assets Valued at NAV
| Combined Pension Plan at December 31,
| 2022 |  | 2021
| (Dollars in millions)
Investment grade bonds (a) | $ | 99 |  |  | 127 |
High yield bonds (b) | 81 |  |  | 70 |
U.S. stocks (d) | 79 |  |  | 71 |
Non-U.S. stocks (e) | 270 |  |  | 398 |
Emerging market stocks (f) | 15 |  |  | 11 |
Private equity (g) | 326 |  |  | 348 |
Private debt (h) | 438 |  |  | 495 |
Market neutral hedge funds (i) | 135 |  |  | 141 |
Directional hedge funds (j) | 166 |  |  | 241 |
Real estate (k) | 333 |  |  | 420 |
Multi-asset strategies (l) | 24 |  |  | 38 |
Cash equivalents and short-term investments (o) | 293 |  |  | 330 |
Total investments valued at NAV | $ | 2,259 |  |  | 2,690 |
Schedule of gross notional exposure of the derivative instruments directly held by the plans |
| Gross Notional Exposure
| Combined Pension Plan Years Ended December 31,
| 2022 |  | 2021
| (Dollars in millions)
Derivative instruments: |  |  |
Exchange-traded U.S. equity futures | $ | 70 |  |  | 108 |
Exchange-traded Treasury and other interest rate futures | 1,256 |  |  | 1,688 |
Exchange-traded Foreign currency futures | 2 |  |  | 11 |
Exchange-traded EURO futures | — |  |  | 5 |
Interest rate swaps | 82 |  |  | 127 |
Credit default swaps | 139 |  |  | 132 |
Index swaps | 90 |  |  | 1,036 |
Foreign exchange forwards | 50 |  |  | 93 |
Options | 251 |  |  | 654 |
Summary of changes in fair value of defined benefit plans' Level 3 assets | The table below presents a rollforward of the Combined Pension Plan assets valued using Level 3 inputs:
| Combined Pension Plan Assets Valued Using Level 3 Inputs
| High Yield Bonds |  | U.S. Stocks |  |  |  | Total
| (Dollars in millions)
Balance at December 31, 2020 | $ | 6 |  |  | 2 |  |  |  |  | 8 |
Actual return on plan assets | — |  |  | 3 |  |  |  |  | 3 |
Balance at December 31, 2021 | 6 |  |  | 5 |  |  |  |  | 11 |
Dispositions | (1) |  |  | (4) |  |  |  |  | (5) |
Actual return on plan assets | (1) |  |  | — |  |  |  |  | (1) |
Balance at December 31, 2022 | $ | 4 |  |  | 1 |  |  |  |  | 5 |
Schedule of the unfunded status of the benefit plans | The following table presents the unfunded status of the Combined Pension Plan and post-retirement benefit plans:
| Combined Pension Plan |  | Post-Retirement Benefit Plans
| Years Ended December 31, |  | Years Ended December 31,
| 2022 |  | 2021 |  | 2022 |  | 2021
| (Dollars in millions)
Benefit obligation | $ | (5,295) |  |  | (9,678) |  |  | (1,995) |  |  | (2,781) |
Fair value of plan assets | 4,715 |  |  | 8,531 |  |  | 5 |  |  | 5 |
Unfunded status | (580) |  |  | (1,147) |  |  | (1,990) |  |  | (2,776) |
Current portion of unfunded status | — |  |  | — |  |  | (210) |  |  | (212) |
Non-current portion of unfunded status | $ | (580) |  |  | (1,147) |  |  | (1,780) |  |  | (2,564) |
Schedule of items not recognized as a component of net periodic benefits expense | The following table presents cumulative items not recognized as a component of net periodic benefits expense as of December 31, 2021, items recognized as a component of net periodic benefits expense in 2022, additional items deferred during 2022 and cumulative items not recognized as a component of net periodic benefits expense as of December 31, 2022. The items not recognized as a component of net periodic benefits expense have been recorded on our consolidated balance sheets in accumulated other comprehensive loss:
| As of and for the Years Ended December 31,
| 2021 |  | Recognition of Net Periodic Benefits Expense |  | Deferrals |  | Net Change in AOCL |  | 2022
| (Dollars in millions)
Accumulated other comprehensive (loss) income |  |  |  |  |  |  |  |  |
Pension plans: |  |  |  |  |  |  |  |  |
Net actuarial (loss) gain | $ | (2,564) |  |  | 688 |  |  | 124 |  |  | 812 |  |  | (1,752) |
Settlement charge | 383 |  |  | — |  |  | — |  |  | — |  |  | 383 |
Prior service benefit (cost) | 45 |  |  | (28) |  |  | — |  |  | (28) |  |  | 17 |
Deferred income tax benefit (expense) | 559 |  |  | (166) |  |  | (26) |  |  | (192) |  |  | 367 |
Total pension plans | (1,577) |  |  | 494 |  |  | 98 |  |  | 592 |  |  | (985) |
Post-retirement benefit plans: |  |  |  |  |  |  |  |  |
Net actuarial (loss) gain | (217) |  |  | (3) |  |  | 591 |  |  | 588 |  |  | 371 |
Prior service (cost) benefit | (5) |  |  | 1 |  |  | 41 |  |  | 42 |  |  | 37 |
Curtailment loss | 4 |  |  | — |  |  | — |  |  | — |  |  | 4 |
Deferred income tax benefit (expense) | 54 |  |  | 1 |  |  | (159) |  |  | (158) |  |  | (104) |
Total post-retirement benefit plans | (164) |  |  | (1) |  |  | 473 |  |  | 472 |  |  | 308 |
Total accumulated other comprehensive (loss) income | $ | (1,741) |  |  | 493 |  |  | 571 |  |  | 1,064 |  |  | (677) |
The following table presents cumulative items not recognized as a component of net periodic benefits expense as of December 31, 2020, items recognized as a component of net periodic benefits expense in 2021, additional items deferred during 2021 and cumulative items not recognized as a component of net periodic benefits expense as of December 31, 2020. The items not recognized as a component of net periodic benefits expense have been recorded on our consolidated balance sheets in accumulated other comprehensive loss:
| As of and for the Years Ended December 31,
| 2020 |  | Recognition of Net Periodic Benefits Expense |  | Deferrals |  | Net Change in AOCL |  | 2021
| (Dollars in millions)
Accumulated other comprehensive (loss) income |  |  |  |  |  |  |  |  |
Pension plans: |  |  |  |  |  |  |  |  |
Net actuarial (loss) gain | $ | (2,993) |  |  | 186 |  |  | 243 |  |  | 429 |  |  | (2,564) |
Settlement charge | — |  |  | 383 |  |  | — |  |  | 383 |  |  | 383 |
Prior service benefit (cost) | 41 |  |  | (9) |  |  | 13 |  |  | 4 |  |  | 45 |
Deferred income tax benefit (expense) | 755 |  |  | (137) |  |  | (59) |  |  | (196) |  |  | 559 |
Total pension plans | (2,197) |  |  | 423 |  |  | 197 |  |  | 620 |  |  | (1,577) |
Post-retirement benefit plans: |  |  |  |  |  |  |  |  |
Net actuarial (loss) gain | (346) |  |  | 4 |  |  | 125 |  |  | 129 |  |  | (217) |
Prior service (cost) benefit | (20) |  |  | 15 |  |  | — |  |  | 15 |  |  | (5) |
Curtailment loss | 4 |  |  | — |  |  | — |  |  | — |  |  | 4 |
Deferred income tax benefit (expense) | 90 |  |  | (5) |  |  | (31) |  |  | (36) |  |  | 54 |
Total post-retirement benefit plans | (272) |  |  | 14 |  |  | 94 |  |  | 108 |  |  | (164) |
Total accumulated other comprehensive (loss) income | $ | (2,469) |  |  | 437 |  |  | 291 |  |  | 728 |  |  | (1,741) |

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