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Equity Compensation Plans (Tables) | 3 Months Ended
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Mar. 31, 2013
Equity Compensation Plans |
Summary of Class B unit awards |
|  | Reserved for Future Grants |  | Outstanding |  | Outstanding Units Earned |  |  | Grant Date Fair Value of Outstanding Class B Units (1) (in millions) |
Balance at December 31, 2012 |  | 17,875 |  | 182,125 |  | 130,250 |  |  | $ | 44 |
Granted |  | (3,500 | ) | 3,500 |  | — |  |  | 6 |
Earned |  | N/A |  | N/A |  | 26,000 |  |  | N/A |
Balance at March 31, 2013 |  | 14,375 |  | 185,625 |  | 156,250 |  |  | $ | 50 |
(1) Of the grant date fair value, less than $1 million was recognized as expense during the three months ended March 31, 2013.
Summary of equity compensation activity | Other Equity Compensation Information. Our equity compensation activity for LTIP awards denominated in PAA and PNG units is summarized in the following table (units in millions):
|  | PAA Units (1) |  | PNG Units (2) (3) |
|  | Units |  | Weighted Average Grant Date Fair Value per Unit |  | Units |  | Weighted Average Grant Date Fair Value per Unit |
Outstanding at December 31, 2012 |  | 6.0 |  | $ | 25.55 |  | 0.9 |  | $ | 17.49 |
Granted |  | 4.1 |  | $ | 47.04 |  | 0.4 |  | $ | 17.42 |
Cancelled or forfeited |  | (0.1 | ) | $ | 31.47 |  | — |  | $ | — |
Outstanding at March 31, 2013 |  | 10.0 |  | $ | 34.24 |  | 1.3 |  | $ | 17.47 |
(1) Amounts do not include Class B Units of Plains AAP, L.P. (2) Amounts do not include PNGS GP LLC Class B Units. (3) Amounts include PNG Transaction Grants.
Summary of expense recognized and value of vesting related to equity compensation plans | The table below summarizes the expense recognized and the value of vesting (settled both in units and cash) related to our equity compensation plans (in millions):
|  | Three Months Ended |
|  | March 31, |
|  | 2013 |  | 2012 |
Equity compensation expense |  | $ | 51 |  | $ | 39 |
LTIP unit-settled vestings |  | $ | — |  | $ | 24 |
LTIP cash-settled vestings |  | $ | — |  | $ | 36 |
DER cash payments |  | $ | 2 |  | $ | 2 |

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- Definition Tabular disclosure of the changes in a particular unit class of the general partner. Includes changes in units reserved for future grants and outstanding units. + References No definition available. + Details
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- Definition Disclosure that sets forth the equity compensation plan expense, the fair value of vesting (settled both in units and cash) related to the equity compensation plans, and the cash payments related to distribution equivalent rights for the period. + References No definition available. + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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