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Stock Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | 16,000,000 |  |  |
Stock options vested during period less than 1 million in 2013 and 2012 |  |  |  | 1,000,000
Total Fair Value of stock options vested |  |  | $ 1 |
Compensation expense | $ 1 | $ 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 | 250,499 | 207,248 | 257,513 |
Shares issued under employee purchase plan, Average price per share | $ 36.66 | $ 36.07 | $ 30.57 |
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 | 15,000,000 |  |  |
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 | $ 39.65 | $ 35.16 | 31.41 |
Unrecognized compensation cost related to stock options expected to be recognized | $ 5 |  |  |
Weighted average period for recognizing unrecognized compensation cost | 1 year |  |  |
Total intrinsic value of restricted stock units vested | $ 11 | $ 12 |  | $ 4
Dividend equivalents accrued on stock units | 43,081 |  |  |
Performance Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted average grant date fair value of granted shares | $ 41.32 | $ 38.94 | $ 35.07 |
Total intrinsic value of performance units vested | $ 13 | $ 6 | $ 5 |
Unrecognized compensation cost related to stock options expected to be recognized | $ 15 |  |  |
Weighted average period for recognizing unrecognized compensation cost | 1 year |  |  |
Dividend equivalents accrued on stock units | 44,559 |  |  |
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 | 3,700,000 |  |  |
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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