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Acquisitions and Disposition - Narrative (Details) - USD ($) |  |  | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 26, 2021 | Jan. 04, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Nov. 19, 2020 | Dec. 31, 2019 | Feb. 12, 2019
Business Acquisition [Line Items] |  |  |  |  |  |  |
Long-term debt |  |  |  | $ 7,825,000,000 |  | $ 6,631,000,000 |
Goodwill |  |  |  | $ 2,544,000,000 |  | $ 2,545,000,000 |
Forecast |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Loss on disposition |  |  | $ 3,000,000,000 |  |  |  |
Subsequent Event |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Proceeds from affiliates | $ 2,800,000,000 |  |  |  |  |  |
Senior Notes Due 2025 at 0.750 Percent |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Long-term debt |  |  |  |  | $ 600,000,000 |  |
Note stated interest rate (as a percent) |  |  |  | 0.75% | 0.75% |  |
Senior Notes Due 2030 at 1.45 Percent |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Long-term debt |  |  |  |  | $ 600,000,000 |  |
Note stated interest rate (as a percent) |  |  |  | 1.45% | 1.45% |  |
National General | Subsequent Event |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Consideration transferred |  | $ 4,000,000,000 |  |  |  |  |
Share price, cash (in shares) |  | $ 32.00 |  |  |  |  |
Share price, dividend (in USD per share) |  | 2.50 |  |  |  |  |
Share price (in USD per share) |  | $ 34.50 |  |  |  |  |
iCracked |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 17,000,000

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