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Stock-Based Incentive Compensation Plans (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Performance Shares [Member] |  |  |
Narrative [Abstract] |  |  |
Vesting period (in years) | 3 years |  |
Performance Shares [Member] | Maximum [Member] |  |  |
Narrative [Abstract] |  |  |
Share based compensation, Performance issuance as percent or original grant | 200.00% |  |
Performance Shares [Member] | Minimum [Member] |  |  |
Narrative [Abstract] |  |  |
Share based compensation, Performance issuance as percent or original grant | 0.00% |  |
Stock options with performance conditions [Member] |  |  |
Narrative [Abstract] |  |  |
Contractual term | 5 years |  |
Vesting period (in years) | 2 years |  |
Total fair value of options vested | $ 1 | $ 1 | $ 2
Total intrinsic value of options exercised | $ 1 | 2 | 12
Stock options with service conditions [Member] |  |  |
Narrative [Abstract] |  |  |
Contractual term | 10 years |  |
Vesting period (in years) | 3 years |  |
Total fair value of options vested | $ 7 | 6 | 6
Total intrinsic value of options exercised | $ 3 | 11 | 23
SARs [Member] |  |  |
Narrative [Abstract] |  |  |
Contractual term | 5 years |  |
Vesting period (in years) | 4 years |  |
Percentage of SARs vesting each year over four-year period | 25.00% |  |
SARs liability | $ 1 | 1 |
Payment for SARs exercised | $ 1 | $ 1 | $ 3

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- Definition Aggregate cash paid by the entity during the period to settle equity instruments granted under equity-based payment arrangements. + 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 (k) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(1) -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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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. + 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) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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