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Note 5 - Retirement Plans (Tables)

12 Months Ended

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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