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Stock-Based Compensation - Stock Options (Details) - Common Shares - Stock Options - Long-Term Incentive Plans - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 3 years |  |
Stock compensation, stock option rollforward schedule, number of options |  |  |
Outstanding, begin of period (in shares) | 806,000 |  |
Exercisable options, beginning of period (in shares) | 420,000 |  |
Exercised options (in shares) | (339,000) |  |
Expired options (in shares) | (7,000) |  |
Outstanding, end of period (in shares) | 460,000 | 806,000 |
Exercisable options, ending of period (in shares) | 460,000 | 420,000 |
Stock compensation, stock option rollforward schedule, other information |  |  |
Options outstanding, begin of period - weighted average exercise price (USD per share) | $ 43.10 |  |
Options exercisable, begin of period - weighted average exercise price (USD per share) | 42.39 |  |
Options exercised, weighted average exercise price (USD per share) | 44.27 |  |
Options expired, weighted average exercise price (USD per share) | 45.87 |  |
Options outstanding, end of period - weighted average exercise price (USD per share) | 42.20 | $ 43.10 |
Options exercisable, end of period - weighted average exercise price (USD per share) | $ 42.20 | $ 42.39 |
Aggregate intrinsic value, options outstanding | $ 0 |  |
Aggregate intrinsic value, options exercisable | $ 0 |  |
Weighted average remaining contractual life, outstanding | 4 years 10 months 24 days |  |
Weighted average remaining contractual life, exercisable | 4 years 10 months 24 days |  |
Aggregate intrinsic value, options exercised | $ 3 | $ 19 | $ 1
Terminated Employees |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expiration period | 30 days |  |
Minimum | Retired Employees |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Exercisable term | 90 days |  |
Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expiration period | 10 years |  |
Maximum | Retired Employees |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Exercisable term | 1 year |  |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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