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Note 3 - Stock-based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2023
Notes Tables |
Share-Based Payment Arrangement, Cost by Plan [Table Text Block] |
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
Millions |  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Stock-based compensation, before tax: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options |  | $ | 4 |  |  | $ | 3 |  |  | $ | 8 |  |  | $ | 7 |
Retention awards |  |  | 15 |  |  |  | 19 |  |  |  | 33 |  |  |  | 41 |
ESPP |  |  | 5 |  |  |  | 4 |  |  |  | 11 |  |  |  | 8 |
Total stock-based compensation, before tax |  | $ | 24 |  |  | $ | 26 |  |  | $ | 52 |  |  | $ | 56 |
Excess income tax benefits from equity compensation plans |  | $ | 1 |  |  | $ | 1 |  |  | $ | 7 |  |  | $ | 18 |
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
Weighted-Average Assumptions |  | 2023 |  |  | 2022 |
Risk-free interest rate |  |  | 3.9 | % |  |  | 1.6 | %
Dividend yield |  |  | 2.6 | % |  |  | 1.9 | %
Expected life (years) |  |  | 4.5 |  |  |  | 4.4 |
Volatility |  |  | 29.3 | % |  |  | 28.7 | %
Weighted-average grant-date fair value of options granted |  | $ | 48.31 |  |  | $ | 51.92 |
Share-Based Payment Arrangement, Option, Activity [Table Text Block] |
| Options (thous.) | Weighted-Average Exercise Price | Weighted-Average Remaining Contractual Term (in years) | Aggregate Intrinsic Value (millions) |
Outstanding at January 1, 2023 |  |  | 1,974 |  |  | $ | 169.64 |  |  |  | 6.0 |  |  | $ | 86 |
Granted |  |  | 351 |  |  |  | 202.81 |  |  |  | N/A |  |  |  | N/A |
Exercised |  |  | (72 | ) |  |  | 107.65 |  |  |  | N/A |  |  |  | N/A |
Forfeited or expired |  |  | (5 | ) |  |  | 224.05 |  |  |  | N/A |  |  |  | N/A |
Outstanding at June 30, 2023 |  |  | 2,248 |  |  | $ | 176.68 |  |  |  | 6.3 |  |  | $ | 75 |
Vested or expected to vest at June 30, 2023 |  |  | 2,228 |  |  | $ | 176.31 |  |  |  | 6.3 |  |  | $ | 75 |
Options exercisable at June 30, 2023 |  |  | 1,580 |  |  | $ | 160.07 |  |  |  | 5.2 |  |  | $ | 75 |
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 |  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Intrinsic value of stock options exercised |  | $ | 3 |  |  | $ | 2 |  |  | $ | 7 |  |  | $ | 44 |
Cash received from option exercises |  |  | 4 |  |  |  | 2 |  |  |  | 8 |  |  |  | 17 |
Treasury shares repurchased for employee payroll taxes |  |  | (1 | ) |  |  | - |  |  |  | (2 | ) |  |  | (5 | )
Income tax benefit realized from option exercises |  |  | 1 |  |  |  | 1 |  |  |  | 2 |  |  |  | 6 |
Aggregate grant-date fair value of stock options vested |  |  | - |  |  |  | - |  |  |  | 14 |  |  |  | 13 |
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, 2023 |  |  | 1,069 |  |  | $ | 196.47 |
Granted |  |  | 295 |  |  |  | 202.72 |
Vested |  |  | (300 | ) |  |  | 162.65 |
Forfeited |  |  | (25 | ) |  |  | 205.20 |
Nonvested at June 30, 2023 |  |  | 1,039 |  |  | $ | 207.80 |
Schedule of Nonvested Performance-Based Units Activity [Table Text Block] |
| Shares (thous.) | Weighted-Average Grant-Date Fair Value |
Nonvested at January 1, 2023 |  |  | 594 |  |  | $ | 199.82 |
Granted |  |  | 251 |  |  |  | 202.81 |
Vested |  |  | (73 | ) |  |  | 186.67 |
Unearned |  |  | (127 | ) |  |  | 186.11 |
Forfeited |  |  | (4 | ) |  |  | 222.66 |
Nonvested at June 30, 2023 |  |  | 641 |  |  | $ | 205.06 |

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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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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 -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -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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