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Stock Plans (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Restricted Stock Units (RSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period, in years | 3 years |  |
Expense amortization period | 3 years |  |
Pre-tax compensation expense | $ 41 | $ 34 | $ 31
Deferred tax benefit | 10 | 9 | 8
Unamortized compensation expense | $ 73 |  |
Weighted-average period of recognition, in years | 2 years |  |
Weighted-average grant date fair value | $ 59 | $ 48 | $ 49
Weighted-average grant date fair value, per share (in USD per share) | $ 49.22 | $ 45.22 | $ 42.59
Total fair value vested | $ 29 | $ 19 | $ 25
Granted, number of shares (in shares) | 1,206,601 |  |
Number of shares remaining (in shares) | 3,257,795 | 2,702,462 |
Grant date fair value (in USD per share) | $ 46.90 | $ 46.84 |
Performance Shares [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period, in years | 3 years |  |
Pre-tax compensation expense | $ 9 | $ 6 | $ 4
Unamortized compensation expense | $ 13 |  |
Granted, number of shares (in shares) | 215,205 | 229,494 | 275,288
Number of shares remaining (in shares) | 628,693 |  |
Grant date fair value (in USD per share) | $ 47.62 |  |
Common Stock [Member] | 2020 Performance Incentive Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Maximum number of shares issuable under the stock compensation plan (in shares) | 25,000,000 |  |
Shares available to be granted (in shares) | 21,972,920 |  |
Common Stock [Member] | 2015 Directors Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Maximum number of shares issuable under the stock compensation plan (in shares) | 1,000,000 |  |
Shares available to be granted (in shares) | 650,121 |  |

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