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Acquisition (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2019 | Apr. 30, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 4,344 | $ 4,638 | $ 4,310 | $ 3,965 | $ 4,531 | $ 4,264 | $ 4,020 | $ 3,609 |  | $ 17,258 |  | $ 16,424 | $ 14,257
Net income (loss) | $ 431 | $ (161) | $ 363 | $ 252 | $ 399 | $ 490 | $ 385 | $ 367 |  | $ 886 |  | $ 1,641 | $ 2,079
Liberty Transaction [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition agreement date |  |  |  |  |  |  |  |  |  | May 01, 2018 |  |  |
Capital stock acquired, percent |  |  |  |  | 100.00% |  |  |  | 100.00% |  |  | 100.00% |
Acquisition related costs |  |  |  |  |  |  |  |  |  |  |  | $ 85 |
Provisional assets |  |  |  |  |  |  |  |  |  |  | $ (5) |  |
Provisional liabilities |  |  |  |  |  |  |  |  |  |  | 23 |  |
Provisional goodwill |  |  |  |  |  |  |  |  |  |  | $ 28 |  |
Revenues |  |  |  |  |  |  |  |  | $ 1,500 |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | $ 36 |  |  |  |

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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