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Equity-Indexed Compensation Plans - Liability and Activity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Outstanding (in units) |  |  |
Outstanding at beginning of period (in units) | 6.8 | 7.3 | 8.9
Granted (in units) | 3.9 | 1.7 | 0.9
Vested (in units) | (3.3) | (1.7) | (1.7)
Cancelled or forfeited (in units) | (0.3) | (0.5) | (0.8)
Outstanding at end of period (in units) | 7.1 | 6.8 | 7.3
Weighted Average Grant Date Fair Value per Unit |  |  |
Outstanding at beginning of period (in dollars per unit) | $ 22.19 | $ 24.68 | $ 29.62
Granted (in dollars per unit) | 16.17 | 23.44 | 23.52
Vested (in dollars per unit) | 22.44 | 32.42 | 42.12
Modified (in dollars per unit) |  | 2.15 | (6.04)
Cancelled or forfeited (in dollars per unit) | 23.12 | 21.99 | 26.99
Outstanding at end of period (in dollars per unit) | $ 18.67 | $ 22.19 | $ 24.68
Units issued in connection with the settlement of vested awards, net of tax withholding (in units) | 1.4 | 0.6 | 0.6
Units withheld for taxes (in units) | 0.6 | 0.2 | 0.2
Vested awards settled in cash (in units) | 1.3 | 0.9 | 0.9
Liability Awards |  |  |
Equity-Indexed Compensation Plans |  |  |
Accrued liability related to all outstanding LTIP awards and DERs | $ 13 | $ 27 |
Other current liabilities | Liability Awards |  |  |
Equity-Indexed Compensation Plans |  |  |
Short-term accrued liability related to all outstanding LTIP awards and DERs | 10 | 19 |
Other long-term liabilities and deferred credits | Liability Awards |  |  |
Equity-Indexed Compensation Plans |  |  |
Long-term accrued liability related to all outstanding LTIP awards and DERs | $ 3 | $ 8 |

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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements payable within one year (or the operating cycle, if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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)(iv)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + 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)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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