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General - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2020 | Apr. 01, 2020 | Mar. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Apr. 01, 2019 | Mar. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowance for Credit Loss | $ 413 | $ 413 |  | $ 365 | $ 289 |  |  |  |  |  |
Stockholders' equity | (26,986) | (26,986) |  |  |  | $ (25,998) | $ (24,476) |  |  |  |
Premium installment receivables | 139 | 139 |  | 96 | 91 | 91 |  |  |  |  |
Credit Loss expense | 94 | 136 |  |  |  |  |  |  |  |  |
Writeoffs | 51 | 88 |  |  |  |  |  |  |  |  |
Retained income |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity | $ (49,380) | $ (49,380) |  | $ (48,326) |  | $ (48,074) | $ (45,803) |  | $ (45,148) |  | $ (44,033)
Cumulative effect of change in accounting principle | Retained income |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  | $ 0 |  | 88 |  |  | $ 0 |  | $ (21) |
Cumulative effect of change in accounting principle | Minimum | Retained income | Accounting Standards Update 2016-13 |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity |  |  |  |  | $ (88) |  |  |  |  |  |

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- Definition Amount of expense (reversal of expense) for expected credit loss on premium 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 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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