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Share-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Millions | 3 Months Ended
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Mar. 31, 2017 USD ($) program $ / shares peer_group shares | Mar. 31, 2016 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Discount from market price | 15.00% |
Common stock shares reserved for future issuance (in shares) | 5,600,000 |
Stock option awards granted (in shares) | 268,817 |
Net cash proceeds from the exercise of stock options | $ | $ 1 | $ 2
Stock options exercised in period (in shares) | 40,416 | 86,811
Share Price (in dollars per share) | $ / shares | $ 69.45 |
Stock options, exercisable (in shares) | 1,365,955 | 2,500,000
Weighted-average exercise price (in dollars per share) | $ / shares | $ 22.35 | $ 27.87
Total pre-tax intrinsic value of stock options exercised | $ | $ 2 | $ 3
Compensation expense | $ | 15 | $ 16
Restricted stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total unrecognized compensation cost | $ | $ 69 |
Weighted-average period unrecognized compensation cost is expected to be recognized, in years | 1 year 11 months 5 days |
Number of awards granted (in shares) | 559,698 |
Restricted stock | Second Anniversary |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting percentage | 25.00% |
Restricted stock | Third Anniversary |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting percentage | 25.00% |
Restricted stock | Fourth Anniversary |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting percentage | 50.00% |
PSUs | One Year Performance Period |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total unrecognized compensation cost | $ | $ 16 |
Weighted-average period unrecognized compensation cost is expected to be recognized, in years | 1 year 7 months 6 days |
Vesting period | 1 year |
Percentage of target amount granted, minimum | 0.00% |
Percentage of target amount granted, maximum | 150.00% |
Additional units granted above target (in shares) | 56,533 |
Number of awards granted (in shares) | 193,710 |
PSUs | Three Year Performance Period |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total unrecognized compensation cost | $ | $ 38 |
Weighted-average period unrecognized compensation cost is expected to be recognized, in years | 1 year 7 months 1 day |
Vesting period | 3 years |
Additional units granted above target (in shares) | 538,892 |
Number of peer groups | peer_group | 2 |
Performance-based long-term incentive program weighted percentage | 50.00% |
Minimum payout | 0.00% |
Maximum payout | 200.00% |
Number of awards granted (in shares) | 801,448 |
Share Price (in dollars per share) | $ / shares | $ 69.45 | $ 66.38
PSUs, Negative TSR | Three Year Performance Period |  |
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 life | 10 years |
Stock option awards granted (in shares) |  | 0
Employee Stock Purchase Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Common stock shares reserved for future issuance (in shares) | 2,300,000 |
Maximum percentage of shares purchased from annual compensation | 10.00% |
Discount given to employees | 15.00% |
Compensation expense | $ | $ 1 | $ 1
Officer | PSUs |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of performance-based programs | program | 2 |
CEO | Employee Stock Option |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting period | 3 years |
Stock option awards granted (in shares) | 268,817 |

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