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General (Tables) | 6 Months Ended
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Jun. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Schedule of Net Income for Shareholders and Participating Securities [Table Text Block] | The following tables set forth the allocation of net income available to shareholders of Class P shares and participating securities and the reconciliation of Basic Weighted Average Common Shares Outstanding to Diluted Weighted Average Common Shares Outstanding (in millions):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2016 |  | 2015 |  | 2016 |  | 2015
Class P | $ | 332 |  |  | $ | 330 |  |  | $ | 607 |  |  | $ | 756 |
Participating securities: |  |  |  |  |  |  |
Restricted stock awards(a) | 1 |  |  | 3 |  |  | 2 |  |  | 6 |
Net Income Available to Common Stockholders | $ | 333 |  |  | $ | 333 |  |  | $ | 609 |  |  | $ | 762 |
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2016 |  | 2015 |  | 2016 |  | 2015
Basic Weighted Average Common Shares Outstanding | 2,229 |  |  | 2,175 |  |  | 2,229 |  |  | 2,158 |
Effect of dilutive securities: |  |  |  |  |  |  |
Warrants | — |  |  | 12 |  |  | — |  |  | 11 |
Diluted Weighted Average Common Shares Outstanding | 2,229 |  |  | 2,187 |  |  | 2,229 |  |  | 2,169 |
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(a) | As of June 30, 2016, there were approximately 8 million such restricted stock awards.
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] | The following maximum number of potential common stock equivalents are antidilutive and, accordingly, are excluded from the determination of diluted earnings per share (in millions on a weighted-average basis):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2016 |  | 2015 |  | 2016 |  | 2015
Unvested restricted stock awards | 8 |  |  | 7 |  |  | 8 |  |  | 7 |
Warrants to purchase our Class P shares(a) | 293 |  |  | 287 |  |  | 293 |  |  | 288 |
Convertible trust preferred securities | 8 |  |  | 8 |  |  | 8 |  |  | 9 |
Mandatory convertible preferred stock(b) | 58 |  |  | n/a |  |  | 58 |  |  | n/a |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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