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Note 4 - Stock-based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2024
Notes Tables |
Share-Based Payment Arrangement, Cost by Plan [Table Text Block] |
| Three Months Ended |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
Millions |  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
Stock-based compensation, before tax: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options |  | $ | 5 |  |  | $ | 4 |  |  | $ | 9 |  |  | $ | 8 |
Retention awards |  |  | 18 |  |  |  | 15 |  |  |  | 35 |  |  |  | 33 |
ESPP |  |  | 5 |  |  |  | 5 |  |  |  | 10 |  |  |  | 11 |
Total stock-based compensation, before tax |  | $ | 28 |  |  | $ | 24 |  |  | $ | 54 |  |  | $ | 52 |
Excess income tax benefits from equity compensation plans |  | $ | 1 |  |  | $ | 1 |  |  | $ | 10 |  |  | $ | 7 |
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
Weighted-Average Assumptions |  | 2024 |  |  | 2023 |
Risk-free interest rate |  |  | 4.2 | % |  |  | 3.9 | %
Dividend yield |  |  | 2.1 | % |  |  | 2.6 | %
Expected life (years) |  |  | 4.4 |  |  |  | 4.5 |
Volatility |  |  | 28.7 | % |  |  | 29.3 | %
Weighted-average grant-date fair value of options granted |  | $ | 61.75 |  |  | $ | 48.31 |
Share-Based Payment Arrangement, Option, Activity [Table Text Block] |
| Options (thous.) | Weighted-Average Exercise Price | Weighted-Average Remaining Contractual Term (in yrs.) | Aggregate Intrinsic Value (millions) |
Outstanding at January 1, 2024 |  |  | 2,072 |  |  | $ | 180.56 |  |  |  | 5.9 |  |  | $ | 135 |
Granted |  |  | 305 |  |  |  | 248.82 |  |  |  | N/A |  |  |  | N/A |
Exercised |  |  | (152 | ) |  |  | 139.36 |  |  |  | N/A |  |  |  | N/A |
Forfeited or expired |  |  | (19 | ) |  |  | 228.80 |  |  |  | N/A |  |  |  | N/A |
Outstanding at June 30, 2024 |  |  | 2,206 |  |  | $ | 192.42 |  |  |  | 6.1 |  |  | $ | 87 |
Vested or expected to vest at June 30, 2024 |  |  | 2,188 |  |  | $ | 192.10 |  |  |  | 6.1 |  |  | $ | 87 |
Options exercisable at June 30, 2024 |  |  | 1,591 |  |  | $ | 177.29 |  |  |  | 5.0 |  |  | $ | 82 |
Cash Proceeds Received and Tax Benefit from Share-Based Payment Awards [Table Text Block] |
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
Millions |  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
Intrinsic value of stock options exercised |  | $ | 4 |  |  | $ | 3 |  |  | $ | 16 |  |  | $ | 7 |
Cash received from option exercises |  |  | 9 |  |  |  | 4 |  |  |  | 24 |  |  |  | 8 |
Treasury shares repurchased for employee payroll taxes |  |  | (1 | ) |  |  | (1 | ) |  |  | (5 | ) |  |  | (2 | )
Income tax benefit realized from option exercises |  |  | 1 |  |  |  | 1 |  |  |  | 4 |  |  |  | 2 |
Aggregate grant-date fair value of stock options vested |  |  | - |  |  |  | - |  |  |  | 15 |  |  |  | 14 |
Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] |
|  | Shares (thous.) |  |  | Weighted-Average Grant-Date Fair Value |
Nonvested at January 1, 2024 |  |  | 996 |  |  | $ | 207.76 |
Granted |  |  | 211 |  |  |  | 248.75 |
Vested |  |  | (243 | ) |  |  | 186.53 |
Forfeited |  |  | (26 | ) |  |  | 219.25 |
Nonvested at June 30, 2024 |  |  | 938 |  |  | $ | 222.16 |
Schedule of Nonvested Performance-Based Units Activity [Table Text Block] |
|  | Shares (thous.) |  |  | Weighted-Average Grant-Date Fair Value |
Nonvested at January 1, 2024 |  |  | 617 |  |  | $ | 204.50 |
Granted |  |  | 227 |  |  |  | 248.82 |
Vested |  |  | (119 | ) |  |  | 204.67 |
Unearned |  |  | (70 | ) |  |  | 204.45 |
Forfeited |  |  | (21 | ) |  |  | 227.05 |
Nonvested at June 30, 2024 |  |  | 634 |  |  | $ | 219.60 |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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