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Mergers, Acquisitions and Dispositions Proforma Impact of Merger (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2018 | [3] | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition, Pro Forma Revenue |  | $ 32,342 | [1] | $ 33,823 | [2]
Business Acquisition, Pro Forma Net Income (Loss) |  | $ 1,562 | [1] | $ 2,618 | [2]
Business Acquisition, Pro Forma Earnings Per Share, Basic |  | $ 1.69 | [1] | $ 2.85 | [2]
Business Acquisition, Pro Forma Earnings Per Share, Diluted |  | $ 1.69 | [1] | $ 2.84 | [2]
Noncash Merger Related Costs | $ 0 | $ 0 | [4] | $ 558 | [5],[6]
Consolidation, Eliminations [Member] |  |  |  |  |
Business Acquisition, Pro Forma Revenue |  | 171 |  | 559 |
Noncash Merger Related Costs |  | $ 680 |  | $ 92 |
[1] | The amounts above exclude non-recurring costs directly related to the merger of $680 million and intercompany revenue of $171 million for the year ended
[2] | The amounts above exclude non-recurring costs directly related to the merger of $92 million and intercompany revenue of $559 million for the year ended
[3] | See Note 5 - Mergers, Acquisitions and Dispositions for additional information.
[4] | See Note 5 - Mergers, Acquisitions and Dispositions for additional information.
[5] | Excludes $5 million of forgiveness of Accounts receivable related to merger commitments recorded in connection with the PHI Merger, the balance is included within Provision for uncollectible accounts.
[6] | See Note 5 - Mergers, Acquisitions and Dispositions for additional information.

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- Definition The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition Amount of expense (income) related to the increase (decrease) in reserve for business combination costs. Includes, but is not limited to, legal, accounting, and other costs incurred to consummate the merger. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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