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Share-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jan. 30, 2018 | Jan. 31, 2017 $ / shares shares | Sep. 30, 2018 USD ($) $ / shares peer_group shares | Mar. 31, 2018 shares | Sep. 30, 2017 USD ($) $ / shares shares | Sep. 30, 2018 USD ($) program $ / shares peer_group shares | Sep. 30, 2017 USD ($) $ / shares shares | Dec. 31, 2017 | Jun. 29, 2018 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common stock shares reserved for future issuance (in shares) |  |  | 11,000,000 |  |  | 11,000,000 |  |  |
Stock options exercised in period (in shares) |  |  | 11,953 |  | 40,160 | 99,953 | 1,074,321 |  |
Net cash proceeds from the exercise of stock options | $ |  |  |  |  | $ 1 | $ 2 | $ 24 |  |
Share price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 85.8
Stock options, exercisable (in shares) |  |  | 289,033 |  | 300,000 | 289,033 | 300,000 |  |
Options exercisable, weighted average exercise price (in dollars per share) | $ / shares |  |  | $ 36.55 |  | $ 23.77 | $ 36.55 | $ 23.77 |  |
Total pre-tax intrinsic value of stock options exercised | $ |  |  | $ 1 |  | $ 2 | $ 6 | $ 53 |  |
Compensation expense | $ |  |  | $ 18 |  | $ 18 | $ 51 | $ 52 |  |
Employee Stock Purchase Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Discount from market price |  |  | 15.00% |  | 15.00% | 15.00% | 15.00% |  |
Common stock shares reserved for future issuance (in shares) |  |  | 2,000,000 |  |  | 2,000,000 |  |  |
Maximum percentage of shares purchased from annual compensation |  |  |  |  |  | 10.00% |  |  |
Discount given to employees |  |  |  |  |  | 15.00% |  |  |
Compensation expense | $ |  |  | $ 1 |  | $ 1 | $ 3 | $ 3 |  |
Restricted stock |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Total unrecognized compensation cost | $ |  |  | 58 |  |  | $ 58 |  |  |
Weighted-average period unrecognized compensation cost is expected to be recognized, in years |  |  |  |  |  | 1 year 10 months 15 days |  |  |
PSUs | One-Year Program |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Total unrecognized compensation cost | $ |  |  | 12 |  |  | $ 12 |  |  |
Weighted-average period unrecognized compensation cost is expected to be recognized, in years |  |  |  |  |  | 1 year 6 months |  |  |
Performance period |  |  |  |  |  | 1 year |  | 1 year |
Percentage of target amount granted, minimum |  |  |  |  |  | 0.00% |  |  |
Percentage of target amount granted, maximum |  |  |  |  |  | 150.00% |  |  |
Vesting period |  |  |  |  |  | 3 years |  |  |
Additional units granted above target (in shares) |  |  |  | 14,497 |  |  |  |  |
PSUs | Three-Year Program |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Total unrecognized compensation cost | $ |  |  | $ 34 |  |  | $ 34 |  |  |
Weighted-average period unrecognized compensation cost is expected to be recognized, in years |  |  |  |  |  | 1 year 5 months 20 days |  |  |
Performance period |  |  |  |  |  | 3 years |  |  |
Vesting period |  |  |  |  |  | 3 years |  |  |
Additional units granted above target (in shares) |  |  |  | 237,876 |  |  |  |  |
Number of peer groups | peer_group |  |  | 2 |  |  | 2 |  |  |
Performance-based long-term incentive program weighted percentage |  |  |  |  |  | 50.00% |  |  |
Minimum payout |  |  |  |  |  | 0.00% |  |  |
Maximum payout |  |  |  |  |  | 200.00% |  |  |
Share price (in dollars per share) | $ / shares |  |  | $ 86.24 |  | $ 69.45 | $ 86.24 | $ 69.45 |  |
PSUs | Officer |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of performance-based programs | program |  |  |  |  |  | 2 |  |  |
PSUs, Negative TSR | Three-Year Program |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Maximum payout |  |  |  |  |  | 100.00% |  |  |
Employee Stock Option |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Stock option awards granted (in shares) |  |  |  |  |  | 0 |  |  |
Weighted-average grant date fair value (in dollars per share) | $ / shares |  | $ 66.68 |  |  |  |  |  |  |
Expected life (in years) |  |  |  |  |  | 6 years |  |  |
Employee Stock Option | CEO |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting period |  | 3 years |  |  |  |  |  |  |
Stock option awards granted (in shares) |  | 268,817 |  |  |  |  |  |  |
Second Anniversary | Restricted stock |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  | 25.00% |  |  |
Second Anniversary | Employee Stock Option | CEO |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting percentage | 33.33% |  |  |  |  |  |  |  |
Third Anniversary | Restricted stock |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  | 25.00% |  |  |
Fourth Anniversary | Restricted stock |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  | 50.00% |  |  |

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