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Share-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2017 shares | Dec. 31, 2016 USD ($) program $ / shares peer_group shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) shares | Dec. 30, 2016 $ / 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) |  | 6,700,000 |  |  |
Net cash proceeds from the exercise of stock options | $ |  | $ 41 | $ 18 | $ 32 |
Stock options exercised in period (in shares) |  | 1,219,820 | 682,054 | 1,578,050 |
Share Price (in dollars per share) | $ / shares |  |  |  |  | $ 67.12
Stock options, exercisable (in shares) |  | 1,400,000 | 2,600,000 |  |
Weighted-average exercise price (in dollars per share) | $ / shares |  |  | $ 27.74 |  |
Total pre-tax intrinsic value of stock options exercised | $ |  | $ 40 | $ 17 | $ 33 |
Restricted stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Total unrecognized compensation cost | $ |  | $ 52 |  |  |
Weighted-average period unrecognized compensation cost is expected to be recognized, in years |  | 1 year 8 months 15 days |  |  |
Number of Awards, Granted (in shares) |  | 724,200 | 823,950 | 1,196,441 |
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 | $ |  | $ 10 |  |  |
Weighted-average period unrecognized compensation cost is expected to be recognized, in years |  | 1 year 5 months 2 days |  |  |
Vesting period |  | 1 year |  |  |
Percentage of target amount granted, minimum |  | 0.00% |  |  |
Percentage of target amount granted, maximum |  | 150.00% |  |  |
Number of Awards, Granted (in shares) |  | 242,642 | 206,199 | 328,791 |
PSUs | Three Year Performance Period |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Total unrecognized compensation cost | $ |  | $ 20 |  |  |
Weighted-average period unrecognized compensation cost is expected to be recognized, in years |  | 1 year 3 months 27 days |  |  |
Vesting period |  | 3 years |  |  |
Number of Awards, Granted (in shares) |  | 761,501 | 649,626 | 553,846 |
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% |  |  |
Share Price (in dollars per share) | $ / shares |  | $ 66.36 | $ 50.97 |  |
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] |  |  |  |  |
Vesting period |  | 4 years |  |  |
Stock option life |  | 10 years |  |  |
Stock option awards granted (in shares) |  | 0 | 0 | 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% |  |  |
Scenario, Forecast | PSUs | One Year Performance Period |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of Awards, Granted (in shares) | 56,533 |  |  |  |
Scenario, Forecast | PSUs | Three Year Performance Period |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of Awards, Granted (in shares) | 538,892 |  |  |  |
Officer | PSUs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of performance-based programs | program |  | 2 |  |  |

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