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Note 5 - Retirement Plans (Tables) | 12 Months Ended
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Dec. 31, 2021
Notes Tables |
Schedule of Net Funded Status [Table Text Block] |
Funded Status |  |  |  |  |  |  |  |
Millions |  | 2021 |  |  | 2020 |
Projected Benefit Obligation |  |  |  |  |  |  |  |
Projected benefit obligation at beginning of year |  | $ | 5,658 |  |  | $ | 4,847 |
Service cost |  |  | 110 |  |  |  | 91 |
Interest cost |  |  | 104 |  |  |  | 137 |
Actuarial (gain)/loss |  |  | (346 | ) |  |  | 812 |
Gross benefits paid |  |  | (230 | ) |  |  | (229 | )
Projected benefit obligation at end of year |  | $ | 5,296 |  |  | $ | 5,658 |
Plan Assets |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of year |  | $ | 5,016 |  |  | $ | 4,528 |
Actual (loss)/return on plan assets |  |  | 737 |  |  |  | 686 |
Non-qualified plan benefit contributions |  |  | 31 |  |  |  | 31 |
Gross benefits paid |  |  | (230 | ) |  |  | (229 | )
Fair value of plan assets at end of year |  | $ | 5,554 |  |  | $ | 5,016 |
Funded status at end of year |  | $ | 258 |  |  | $ | (642 | )
Schedule of Amounts Recognized in Balance Sheet [Table Text Block] |
Millions |  | 2021 |  |  | 2020 |
Noncurrent assets |  | $ | 807 |  |  | $ | 8 |
Current liabilities |  |  | (31 | ) |  |  | (30 | )
Noncurrent liabilities |  |  | (518 | ) |  |  | (620 | )
Net amounts recognized at end of year |  | $ | 258 |  |  | $ | (642 | )
Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] |
Millions |  | 2021 |  |  | 2020 |  |  | 2019 |
Net actuarial (loss)/gain |  | $ | 813 |  |  | $ | (408 | ) |  | $ | (88 | )
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |
Actuarial loss |  |  | 141 |  |  |  | 104 |  |  |  | 67 |
Total |  | $ | 954 |  |  | $ | (304 | ) |  | $ | (21 | )
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Table Text Block] |
Underfunded Accumulated Benefit Obligation |  |  |  |  |  |  |  |
Millions |  | 2021 |  |  | 2020 |
Projected benefit obligation |  | $ | 549 |  |  | $ | 605 |
Accumulated benefit obligation |  | $ | 513 |  |  | $ | 560 |
Fair value of plan assets |  |  | - |  |  |  | - |
Underfunded accumulated benefit obligation |  | $ | (513 | ) |  | $ | (560 | )
Defined Benefit Plan, Assumptions [Table Text Block] |
Percentages |  | 2021 |  |  | 2020 |
Discount rate |  |  | 2.80 | % |  |  | 2.42 | %
Compensation increase |  |  | 4.30 | % |  |  | 4.40 | %
Percentages |  | 2021 |  |  | 2020 |  |  | 2019 |
Discount rate for benefit obligations |  |  | 2.42 | % |  |  | 3.26 | % |  |  | 4.23 | %
Discount rate for interest on benefit obligations |  |  | 1.90 | % |  |  | 2.89 | % |  |  | 3.94 | %
Discount rate for service cost |  |  | 2.61 | % |  |  | 3.42 | % |  |  | 4.33 | %
Discount rate for interest on service cost |  |  | 2.53 | % |  |  | 3.36 | % |  |  | 4.30 | %
Expected return on plan assets |  |  | 6.25 | % |  |  | 7.00 | % |  |  | 7.00 | %
Compensation increase |  |  | 4.40 | % |  |  | 4.10 | % |  |  | 4.10 | %
Schedule of Net Benefit Costs [Table Text Block] |
Millions |  | 2021 |  |  | 2020 |  |  | 2019 |
Net Periodic Pension Cost: |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 110 |  |  | $ | 91 |  |  | $ | 80 |
Interest cost |  |  | 104 |  |  |  | 137 |  |  |  | 160 |
Expected return on plan assets |  |  | (270 | ) |  |  | (282 | ) |  |  | (273 | )
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |
Actuarial loss |  |  | 141 |  |  |  | 104 |  |  |  | 67 |
Net periodic pension cost |  | $ | 85 |  |  | $ | 50 |  |  | $ | 34 |
Cash Contributions for Qualified Pension Plan, Benefit Payments for Non Qualified OPEB Plans [Table Text Block] |
Millions |  | Qualified |  |  | Non-qualified |
2021 |  | $ | - |  |  | $ | 31 |
2020 |  |  | - |  |  |  | 31 |
Schedule of Expected Benefit Payments [Table Text Block] |
Millions |  |  |  |
2022 |  | $ | 229 |
2023 |  |  | 228 |
2024 |  |  | 227 |
2025 |  |  | 227 |
2026 |  |  | 228 |
Years 2027 - 2031 |  |  | 1,170 |
Schedule of Allocation of Plan Assets [Table Text Block] |
|  |  | Percentage of Plan Assets |
| Target | December 31, |
| Allocation 2022 | 2021 |  |  | 2020 |
Equity securities |  |  | 45% to 55% |  |  |  | 57 | % |  |  | 63 | %
Debt securities |  |  | 45% to 55% |  |  |  | 42 |  |  |  | 34 |
Real estate |  |  | 0% to 2% |  |  |  | 1 |  |  |  | 3 |
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 |  | $ | 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 |
|  | 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] |  |  | 252 |  |  |  | - |  |  |  | - |  |  |  | 252 |
Federal government securities |  |  | - |  |  |  | 150 |  |  |  | - |  |  |  | 150 |
Bonds and debentures |  |  | - |  |  |  | 831 |  |  |  | - |  |  |  | 831 |
Corporate stock |  |  | 2,209 |  |  |  | 8 |  |  |  | - |  |  |  | 2,217 |
Total plan assets at fair value |  | $ | 2,470 |  |  | $ | 989 |  |  | $ | - |  |  | $ | 3,459 |
Plan assets at NAV: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Registered investment companies [b] |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 312 |
Venture capital and buyout partnerships |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 585 |
Real estate funds |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 161 |
Collective trust and other funds |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 498 |
Total plan assets at NAV |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 1,556 |
Other assets/(liabilities) [c] |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |
Total plan assets |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 5,016 |

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