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Stock Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Excess Tax Benefits | $ 4 | $ 4 | $ 3
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | 16,000,000 |  |
Compensation expense |  | $ 1 | $ 1
Percentage Of Fair Market Value Being Expected Purchase Price Of Employee Stock Purchase Plan | 95.00% |  |
Minimum Holding Period for Stock Purchased through Employee Stock Purchase Plan | 3 months |  |
Percentage Of Fair Market Value Being Expected Purchase Price Of Employee Stock Purchase Plan Non Represented | 90.00% |  |
Maximum Percentage Limit Of Base Pay For Employees For Purchasing Shares | 10.00% |  |
Shares issued under employee stock purchase plan | 288,527 | 262,763 | 250,499
Shares issued under employee purchase plan, Average price per share | $ 42.07 | $ 40.70 | $ 36.66
Various [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 14,000,000 |  |
Restricted Stock Units (RSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted average grant date fair value of granted shares | $ 44.33 | $ 42.28 | $ 39.65
Unrecognized compensation cost related to stock options expected to be recognized | $ 3 |  |
Weighted average period for recognizing unrecognized compensation cost | 10 months |  |
Total intrinsic value of restricted stock units vested | $ 13 | $ 17 | $ 11
Dividend equivalents accrued on stock units | 30,066 |  |
Performance Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted average grant date fair value of granted shares | $ 45.02 | $ 45.97 | $ 41.32
Total intrinsic value of performance units vested | $ 18 | $ 17 | $ 13
Unrecognized compensation cost related to stock options expected to be recognized | $ 16 |  |
Weighted average period for recognizing unrecognized compensation cost | 1 year |  |
Dividend equivalents accrued on stock units | 38,425 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | 100.00% |  |
Employee Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 3,200,000 |  |
Minimum [Member] | Stock Options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period | 1 year |  |
Minimum [Member] | Restricted Stock Units (RSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options vesting period | 3 years |  |
Minimum [Member] | Performance Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | 0.00% |  |
Maximum [Member] | Stock Options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options vesting period | 4 years |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period | 10 years |  |
Maximum [Member] | Performance Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options vesting period | 3 years |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | 200.00% |  |

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