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Stock Compensation (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares available for future grants (in shares) | 19,400 |  |
Total compensation expense for option grants, Restricted Stock Awards and PSU's | $ 151 | $ 89 | $ 109
Stock Options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
The weighted-average remaining contractual term of options outstanding | 4 years |  |
The weighted-average remaining contractual term of options exercisable | 4 years |  |
The aggregate intrinsic value of options outstanding (in dollars) | $ 77 |  |
The aggregate intrinsic value of options exercisable (in dollars) | 69 |  |
The weighted-average grant-date fair values of options granted (in dollars per share) |  | $ 7.88 | $ 6.95
The total intrinsic values of options exercised (in dollars) | 32 | $ 15 | $ 36
Cash proceeds received from options exercised (in dollars) | $ 49 | $ 27 | $ 55
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period | 10 years |  |
Restricted Stock Awards And PSUs [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common shares or units granted as Restricted Stock Awards and PSUs (in shares) | 2,732 | 2,600 | 2,500
Total unrecognized compensation expense | $ 107 |  |
Period during which unrecognized compensation expense is expected to be recognized | 3 years |  |
Amount to be recognized as compensation expense year 1 | $ 67 |  |
Amount to be recognized as compensation expense year 2 | 34 |  |
Amount to be recognized as compensation expense year 3 | $ 6 |  |
Weighted average grant-date fair value of Restricted Stock Awards and PSU's, Granted (in dollars per share) | $ 45.59 | $ 42.11 | $ 42.72
Restricted Stock Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Total fair value of Restricted Stock Awards vested during the period | $ 63 |  |
Performance Stock Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Minimum [Member] | Stock Options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 1 year |  |
Maximum [Member] | Stock Options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 5 years |  |

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