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Note 4 - Stock-based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2022
Notes Tables |
Share-Based Payment Arrangement, Cost by Plan [Table Text Block] |
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
Millions |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Stock-based compensation, before tax: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options |  | $ | 3 |  |  | $ | 4 |  |  | $ | 7 |  |  | $ | 8 |
Retention awards |  |  | 19 |  |  |  | 18 |  |  |  | 41 |  |  |  | 34 |
ESPP |  |  | 4 |  |  |  | - |  |  |  | 8 |  |  |  | - |
Total stock-based compensation, before tax |  | $ | 26 |  |  | $ | 22 |  |  | $ | 56 |  |  | $ | 42 |
Excess tax benefits from equity compensation plans |  | $ | 1 |  |  | $ | 2 |  |  | $ | 18 |  |  | $ | 17 |
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
Weighted-Average Assumptions |  | 2022 |  |  | 2021 |
Risk-free interest rate |  |  | 1.6 | % |  |  | 0.4 | %
Dividend yield |  |  | 1.9 | % |  |  | 1.9 | %
Expected life (years) |  |  | 4.4 |  |  |  | 4.6 |
Volatility |  |  | 28.7 | % |  |  | 28.3 | %
Weighted-average grant-date fair value of options granted |  | $ | 51.92 |  |  | $ | 39.97 |
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, 2022 |  |  | 2,106 |  |  | $ | 149.84 |  |  |  | 6.3 |  |  | $ | 215 |
Granted |  |  | 328 |  |  |  | 244.35 |  |  |  | N/A |  |  |  | N/A |
Exercised |  |  | (339 | ) |  |  | 127.62 |  |  |  | N/A |  |  |  | N/A |
Forfeited or expired |  |  | (25 | ) |  |  | 211.39 |  |  |  | N/A |  |  |  | N/A |
Outstanding at June 30, 2022 |  |  | 2,070 |  |  | $ | 167.71 |  |  |  | 6.5 |  |  | $ | 104 |
Vested or expected to vest at June 30, 2022 |  |  | 2,049 |  |  | $ | 167.17 |  |  |  | 6.4 |  |  | $ | 104 |
Options exercisable at June 30, 2022 |  |  | 1,390 |  |  | $ | 142.20 |  |  |  | 5.3 |  |  | $ | 99 |
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 |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Intrinsic value of stock options exercised |  | $ | 2 |  |  | $ | 9 |  |  | $ | 44 |  |  | $ | 32 |
Cash received from option exercises |  |  | 2 |  |  |  | 4 |  |  |  | 17 |  |  |  | 34 |
Treasury shares repurchased for employee payroll taxes |  |  | - |  |  |  | (1 | ) |  |  | (5 | ) |  |  | (7 | )
Tax benefit realized from option exercises |  |  | 1 |  |  |  | 2 |  |  |  | 6 |  |  |  | 6 |
Aggregate grant-date fair value of stock options vested |  |  | - |  |  |  | - |  |  |  | 13 |  |  |  | 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, 2022 |  |  | 1,287 |  |  | $ | 165.10 |
Granted |  |  | 234 |  |  |  | 244.27 |
Vested |  |  | (408 | ) |  |  | 125.98 |
Forfeited |  |  | (36 | ) |  |  | 190.72 |
Nonvested at June 30, 2022 |  |  | 1,077 |  |  | $ | 196.26 |
Schedule of Nonvested Performance-Based Units Activity [Table Text Block] |
| Shares (thous.) | Weighted-Average Grant-Date Fair Value |
Nonvested at January 1, 2022 |  |  | 641 |  |  | $ | 173.03 |
Granted |  |  | 209 |  |  |  | 244.35 |
Vested |  |  | (56 | ) |  |  | 162.64 |
Unearned |  |  | (163 | ) |  |  | 161.57 |
Forfeited |  |  | (21 | ) |  |  | 207.64 |
Nonvested at June 30, 2022 |  |  | 610 |  |  | $ | 200.29 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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