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Note 5 - Retirement Plans - Plan Assets Measured At Fair Value (Details) - Pension Plan [Member] - USD ($)
$ in Millions

Dec. 31, 2021

Dec. 31, 2020

Dec. 31, 2019

Plan Assets Fair Value

$ 5,554

$ 5,016

$ 4,528

Fair Value, Recurring [Member]

Plan Assets Fair Value

5,554

5,016

Fair Value, Recurring [Member] | Defined Benefit Plan, Debt Security [Member]

Plan Assets Fair Value

^[1]

185

312

Fair Value, Recurring [Member] | Venture Capital And Buyout Partnerships [Member]

Plan Assets Fair Value

710

585

Fair Value, Recurring [Member] | Defined Benefit Plan, Real Estate [Member]

Plan Assets Fair Value

48

161

Fair Value, Recurring [Member] | Common Trust And Other Funds [Member]

Plan Assets Fair Value

756

498

Fair Value, Recurring [Member] | Other Assets Pension Plan [Member]

Plan Assets Fair Value

^[2]

(12)

1

Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]

Plan Assets Fair Value

1,999

2,470

Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Defined Benefit Plan, Cash [Member]

Plan Assets Fair Value

9

9

Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Defined Benefit Plan, Equity Securities [Member]

Plan Assets Fair Value

^[3]

10

252

Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | US Treasury and Government [Member]

Plan Assets Fair Value

0

0

Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member]

Plan Assets Fair Value

0

0

Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Defined Benefit Plan, Equity Securities, Common Stock [Member]

Plan Assets Fair Value

1,980

2,209

Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]

Plan Assets Fair Value

1,868

989

Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Defined Benefit Plan, Cash [Member]

Plan Assets Fair Value

0

0

Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Defined Benefit Plan, Equity Securities [Member]

Plan Assets Fair Value

^[3]

0

0

Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US Treasury and Government [Member]

Plan Assets Fair Value

742

150

Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member]

Plan Assets Fair Value

1,116

831

Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Defined Benefit Plan, Equity Securities, Common Stock [Member]

Plan Assets Fair Value

10

8

Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]

Plan Assets Fair Value

0

0

Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Defined Benefit Plan, Cash [Member]

Plan Assets Fair Value

0

0

Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Defined Benefit Plan, Equity Securities [Member]

Plan Assets Fair Value

^[3]

0

0

Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | US Treasury and Government [Member]

Plan Assets Fair Value

0

0

Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member]

Plan Assets Fair Value

0

0

Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Defined Benefit Plan, Equity Securities, Common Stock [Member]

Plan Assets Fair Value

0

0

Fair Value, Inputs, Level 1, 2 and 3 [Member] | Fair Value, Recurring [Member]

Plan Assets Fair Value

3,867

3,459

Fair Value, Inputs, Level 1, 2 and 3 [Member] | Fair Value, Recurring [Member] | Defined Benefit Plan, Cash [Member]

Plan Assets Fair Value

9

9

Fair Value, Inputs, Level 1, 2 and 3 [Member] | Fair Value, Recurring [Member] | Defined Benefit Plan, Equity Securities [Member]

Plan Assets Fair Value

^[3]

10

252

Fair Value, Inputs, Level 1, 2 and 3 [Member] | Fair Value, Recurring [Member] | US Treasury and Government [Member]

Plan Assets Fair Value

742

150

Fair Value, Inputs, Level 1, 2 and 3 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member]

Plan Assets Fair Value

1,116

831

Fair Value, Inputs, Level 1, 2 and 3 [Member] | Fair Value, Recurring [Member] | Defined Benefit Plan, Equity Securities, Common Stock [Member]

Plan Assets Fair Value

1,990

2,217

Fair Value Measured at Net Asset Value Per Share [Member] | Fair Value, Recurring [Member]

Plan Assets Fair Value

$ 1,699

$ 1,556

[1]	Registered investment companies measured at NAV include bond investments.
[2]	Other assets include accrued receivables, net payables, and pending broker settlements.
[3]	Registered investment companies measured at fair value are stock investments.

X

- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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