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Description of Business and Significant Accounting Policies - Recent Accounting Pronouncements (Details) - ASC 326 - USD ($) $ in Millions |  | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Increase to allowance for credit losses | $ 44 |
Adjustment tax rate |  | 24.00%
Minimum |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Increase to allowance for credit losses | $ 36 |

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- Definition Amount of increase (decrease) in allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 + Details
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