Note 5 - Retirement Plans (Tables)
|
12 Months Ended |
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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