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Note 5 - Retirement Plans (Tables)

12 Months Ended

Dec. 31, 2023

Notes Tables

Schedule of Net Funded Status [Table Text Block]

Funded Status
Millions		2023				2022
Projected Benefit Obligation
Projected benefit obligation at beginning of year		$	3,725			$	5,296
Service cost			52				93
Interest cost			187				123
Actuarial loss/(gain)			146				(1,557	)
Gross benefits paid			(230	)			(230	)
Projected benefit obligation at end of year		$	3,880			$	3,725
Plan Assets
Fair value of plan assets at beginning of year		$	4,363			$	5,554
Actual return/(loss) on plan assets			235				(992	)
Non-qualified plan benefit contributions			32				31
Gross benefits paid			(230	)			(230	)
Fair value of plan assets at end of year		$	4,400			$	4,363
Funded status at end of year		$	520			$	638

Schedule of Amounts Recognized in Balance Sheet [Table Text Block]

Millions		2023				2022
Noncurrent assets		$	924			$	1,033
Current liabilities			(31	)			(31	)
Noncurrent liabilities			(373	)			(364	)
Net amounts recognized at end of year		$	520			$	638

Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]

Millions		2023				2022				2021
Net actuarial (loss)/gain		$	(159	)		$	272			$	813
Amortization of:
Actuarial loss			9				86				141
Total		$	(150	)		$	358			$	954

Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Table Text Block]

Underfunded Accumulated Benefit Obligation
Millions		2023				2022
Projected benefit obligation		$	404			$	394
Accumulated benefit obligation		$	399			$	382
Fair value of plan assets			-				-
Underfunded accumulated benefit obligation		$	(399	)		$	(382	)

Defined Benefit Plan, Assumptions [Table Text Block]

Percentages		2023				2022
Discount rate			5.00	%			5.21	%
Compensation increase			4.00	%			4.10	%

Percentages		2023				2022				2021
Discount rate for benefit obligations			5.21	%			2.80	%			2.42	%
Discount rate for interest on benefit obligations			5.14	%			2.40	%			1.90	%
Discount rate for service cost			5.19	%			2.91	%			2.61	%
Discount rate for interest on service cost			5.21	%			2.86	%			2.53	%
Expected return on plan assets			5.25	%			6.25	%			6.25	%
Compensation increase			4.10	%			4.10	%			4.40	%

Schedule of Net Benefit Costs [Table Text Block]

Millions		2023				2022				2021
Net Periodic Pension Cost:
Service cost		$	52			$	93			$	110
Interest cost			187				123				104
Expected return on plan assets			(248	)			(293	)			(270	)
Amortization of:
Actuarial loss			9				86				141
Net periodic pension cost		$	-			$	9			$	85

Cash Contributions for Qualified Pension Plan, Benefit Payments for Non Qualified OPEB Plans [Table Text Block]

Millions		Qualified				Non-qualified
2023		$	-			$	32
2022		$	-			$	31

Schedule of Expected Benefit Payments [Table Text Block]

Millions
2024		$	230
2025			229
2026			229
2027			230
2028			231
Years 2029 - 2033		$	1,188

Schedule of Allocation of Plan Assets [Table Text Block]

			Percentage of Plan Assets
	Target					December 31,
	Allocation 2024					2023				2022
Equity securities			20% to 30%				24	%			48	%
Debt securities			70% to 80%				75				51
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		$	-			$	-			$	-			$	-
Registered investment companies [a]			-				-				-				-
Federal government securities			-				1,508				-				1,508
Bonds and debentures			-				1,696				-				1,696
Corporate stock			176				5				-				181
Total plan assets at fair value		$	176			$	3,209			$	-			$	3,385
Plan assets at NAV:
Registered investment companies [b]															-
Venture capital and buyout partnerships															554
Real estate funds															30
Collective trust and other funds															382
Total plan assets at NAV														$	966
Other assets/(liabilities) [c]															49
Total plan assets														$	4,400

	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

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