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Note 5 - Retirement Plans (Tables) | 12 Months Ended
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Dec. 31, 2022
Notes Tables |
Schedule of Net Funded Status [Table Text Block] |
Funded Status |  |  |  |  |  |  |  |
Millions |  | 2022 |  |  | 2021 |
Projected Benefit Obligation |  |  |  |  |  |  |  |
Projected benefit obligation at beginning of year |  | $ | 5,296 |  |  | $ | 5,658 |
Service cost |  |  | 93 |  |  |  | 110 |
Interest cost |  |  | 123 |  |  |  | 104 |
Actuarial (gain)/loss |  |  | (1,557 | ) |  |  | (346 | )
Gross benefits paid |  |  | (230 | ) |  |  | (230 | )
Projected benefit obligation at end of year |  | $ | 3,725 |  |  | $ | 5,296 |
Plan Assets |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of year |  | $ | 5,554 |  |  | $ | 5,016 |
Actual (loss)/return on plan assets |  |  | (992 | ) |  |  | 737 |
Non-qualified plan benefit contributions |  |  | 31 |  |  |  | 31 |
Gross benefits paid |  |  | (230 | ) |  |  | (230 | )
Fair value of plan assets at end of year |  | $ | 4,363 |  |  | $ | 5,554 |
Funded status at end of year |  | $ | 638 |  |  | $ | 258 |
Schedule of Amounts Recognized in Balance Sheet [Table Text Block] |
Millions |  | 2022 |  |  | 2021 |
Noncurrent assets |  | $ | 1,033 |  |  | $ | 807 |
Current liabilities |  |  | (31 | ) |  |  | (31 | )
Noncurrent liabilities |  |  | (364 | ) |  |  | (518 | )
Net amounts recognized at end of year |  | $ | 638 |  |  | $ | 258 |
Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] |
Millions |  | 2022 |  |  | 2021 |  |  | 2020 |
Net actuarial (loss)/gain |  | $ | 272 |  |  | $ | 813 |  |  | $ | (408 | )
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |
Actuarial loss |  |  | 86 |  |  |  | 141 |  |  |  | 104 |
Total |  | $ | 358 |  |  | $ | 954 |  |  | $ | (304 | )
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Table Text Block] |
Underfunded Accumulated Benefit Obligation |  |  |  |  |  |  |  |
Millions |  | 2022 |  |  | 2021 |
Projected benefit obligation |  | $ | 394 |  |  | $ | 549 |
Accumulated benefit obligation |  | $ | 382 |  |  | $ | 513 |
Fair value of plan assets |  |  | - |  |  |  | - |
Underfunded accumulated benefit obligation |  | $ | (382 | ) |  | $ | (513 | )
Defined Benefit Plan, Assumptions [Table Text Block] |
Percentages |  | 2022 |  |  | 2021 |
Discount rate |  |  | 5.21 | % |  |  | 2.80 | %
Compensation increase |  |  | 4.10 | % |  |  | 4.30 | %
Percentages |  | 2022 |  |  | 2021 |  |  | 2020 |
Discount rate for benefit obligations |  |  | 2.80 | % |  |  | 2.42 | % |  |  | 3.26 | %
Discount rate for interest on benefit obligations |  |  | 2.40 | % |  |  | 1.90 | % |  |  | 2.89 | %
Discount rate for service cost |  |  | 2.91 | % |  |  | 2.61 | % |  |  | 3.42 | %
Discount rate for interest on service cost |  |  | 2.86 | % |  |  | 2.53 | % |  |  | 3.36 | %
Expected return on plan assets |  |  | 6.25 | % |  |  | 6.25 | % |  |  | 7.00 | %
Compensation increase |  |  | 4.10 | % |  |  | 4.40 | % |  |  | 4.10 | %
Schedule of Net Benefit Costs [Table Text Block] |
Millions |  | 2022 |  |  | 2021 |  |  | 2020 |
Net Periodic Pension Cost: |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 93 |  |  | $ | 110 |  |  | $ | 91 |
Interest cost |  |  | 123 |  |  |  | 104 |  |  |  | 137 |
Expected return on plan assets |  |  | (293 | ) |  |  | (270 | ) |  |  | (282 | )
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |
Actuarial loss |  |  | 86 |  |  |  | 141 |  |  |  | 104 |
Net periodic pension cost |  | $ | 9 |  |  | $ | 85 |  |  | $ | 50 |
Cash Contributions for Qualified Pension Plan, Benefit Payments for Non Qualified OPEB Plans [Table Text Block] |
Millions |  | Qualified |  |  | Non-qualified |
2022 |  | $ | - |  |  | $ | 31 |
2021 |  |  | - |  |  |  | 31 |
Schedule of Expected Benefit Payments [Table Text Block] |
Millions |  |  |  |
2023 |  | $ | 230 |
2024 |  |  | 228 |
2025 |  |  | 227 |
2026 |  |  | 228 |
2027 |  |  | 229 |
Years 2028 - 2032 |  |  | 1,172 |
Schedule of Allocation of Plan Assets [Table Text Block] |
|  |  | Percentage of Plan Assets |
| Target | December 31, |
| Allocation 2023 | 2022 |  |  | 2021 |
Equity securities |  |  | 20% to 30% |  |  |  | 48 | % |  |  | 57 | %
Debt securities |  |  | 70% to 80% |  |  |  | 51 |  |  |  | 42 |
Real estate |  |  | 0% to 2% |  |  |  | 1 |  |  |  | 1 |
Total |  |  |  | 100 | % |  |  | 100 | %
Defined Benefit Plan, Plan Assets, Category [Table Text Block] |
| Quoted Prices | Significant |  |  |
| in Active | Other | Significant |  |
| Markets for | Observable | Unobservable |  |
| Identical Inputs | Inputs | Inputs |  |
Millions | (Level 1) | (Level 2) | (Level 3) | Total |
Plan assets at fair value: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary cash investments |  | $ | 1 |  |  | $ | - |  |  | $ | - |  |  | $ | 1 |
Registered investment companies [a] |  |  | 6 |  |  |  | - |  |  |  | - |  |  |  | 6 |
Federal government securities |  |  | - |  |  |  | 803 |  |  |  | - |  |  |  | 803 |
Bonds and debentures |  |  | - |  |  |  | 1,069 |  |  |  | - |  |  |  | 1,069 |
Corporate stock |  |  | 1,104 |  |  |  | 7 |  |  |  | - |  |  |  | 1,111 |
Total plan assets at fair value |  | $ | 1,111 |  |  | $ | 1,879 |  |  | $ | - |  |  | $ | 2,990 |
Plan assets at NAV: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered investment companies [b] |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 68 |
Venture capital and buyout partnerships |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 611 |
Real estate funds |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 37 |
Collective trust and other funds |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 622 |
Total plan assets at NAV |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 1,338 |
Other assets/(liabilities) [c] |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35 |
Total plan assets |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 4,363 |
| Quoted Prices | Significant |  |  |
| in Active | Other | Significant |  |
| Markets for | Observable | Unobservable |  |
| Identical Inputs | Inputs | Inputs |  |
Millions | (Level 1) | (Level 2) | (Level 3) | Total |
Plan assets at fair value: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary cash investments |  | $ | 9 |  |  | $ | - |  |  | $ | - |  |  | $ | 9 |
Registered investment companies [a] |  |  | 10 |  |  |  | - |  |  |  | - |  |  |  | 10 |
Federal government securities |  |  | - |  |  |  | 742 |  |  |  | - |  |  |  | 742 |
Bonds and debentures |  |  | - |  |  |  | 1,116 |  |  |  | - |  |  |  | 1,116 |
Corporate stock |  |  | 1,980 |  |  |  | 10 |  |  |  | - |  |  |  | 1,990 |
Total plan assets at fair value |  | $ | 1,999 |  |  | $ | 1,868 |  |  | $ | - |  |  | $ | 3,867 |
Plan assets at NAV: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered investment companies [b] |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 185 |
Venture capital and buyout partnerships |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 710 |
Real estate funds |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 48 |
Collective trust and other funds |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 756 |
Total plan assets at NAV |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 1,699 |
Other assets/(liabilities) [c] |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (12 | )
Total plan assets |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 5,554 |

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