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Acquisitions and Dispositions - Narrative (Details) $ / shares in Units, $ in Millions |  |  |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
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Jul. 15, 2021 USD ($) $ / shares | Mar. 15, 2021 USD ($) | Feb. 03, 2021 USD ($) | Jan. 26, 2021 USD ($) | Jan. 04, 2021 USD ($) | Jun. 30, 2021 USD ($) state $ / shares | Mar. 31, 2021 USD ($) | Mar. 31, 2021 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2021 USD ($) | Jun. 30, 2021 USD ($) state $ / shares | Jun. 30, 2020 USD ($) | Dec. 31, 2021 USD ($) | Mar. 29, 2021 USD ($) | Dec. 31, 2020 USD ($) $ / shares
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 3,349 |  |  |  |  | $ 3,349 |  |  |  | $ 2,369
Long-term debt |  |  |  |  |  | 7,996 |  |  |  |  | 7,996 |  |  |  | $ 7,825
Amortization of purchased intangibles |  |  |  |  |  | $ 105 |  |  | $ 29 |  | $ 158 | $ 57 |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  |  |  | $ 1 |  |  |  |  | $ 1 |  |  |  | $ 1
Redemption of preferred stock |  |  |  |  |  |  |  | $ 250 |  |  |  |  |  |  |
Proceeds from affiliates |  |  |  | $ 2,800 |  |  |  |  |  |  |  |  |  |  |
Definitive agreement with Wilton Reassurance |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 220 |
Loss on disposition of operations, net of tax |  |  |  |  |  |  | $ 4,000 |  |  |  | $ 3,971 | $ 0 |  |  |
Noncumulative Preferred Stock | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption of preferred stock | $ 200 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncumulative Preferred Stock | Series A |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  |  |  | 0.01 |  |  |  |  | $ 0.01 |  |  |  |
Preferred stock, dividend rate, percentage |  |  |  |  |  |  |  | 7.50% |  |  |  |  |  |  |
Noncumulative Preferred Stock | Series B |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  |  |  | 0.01 |  |  |  |  | 0.01 |  |  |  |
Preferred stock, dividend rate, percentage |  |  |  |  |  |  |  | 7.50% |  |  |  |  |  |  |
Noncumulative Preferred Stock | Series C | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage | 7.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-Cumulative Convertible Preferred Stock | Series D |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.01 |  |  |  |  | $ 0.01 |  |  |  |
Depository Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depository shares, as a ratio of preferred stock |  |  |  |  |  |  | 0.025 | 0.025 |  |  |  |  |  |  |
Discontinued Operations, Held-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortized cost, net |  |  |  |  |  | $ 23,968 |  |  |  |  | $ 23,968 |  |  |  | $ 21,417
Equity securities, at fair value, cost |  |  |  |  |  | 1,050 |  |  |  |  | 1,050 |  |  |  | 1,113
Other short term Investments, amortized cost |  |  |  |  |  | 901 |  |  |  |  | 901 |  |  |  | $ 993
Subordinated Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repaid of subordinated notes |  | $ 72 | $ 100 |  |  |  |  |  |  |  |  |  |  |  |
Subsequent acquisition (in percentage) |  |  | 7.625% |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  | $ 350 |  |  |  |  | $ 350 |  |  |  |
Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent acquisition (in percentage) |  |  |  |  |  | 6.75% |  |  |  |  | 6.75% |  |  |  |
SafeAuto |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of states acquiree operates in | state |  |  |  |  |  | 28 |  |  |  |  | 28 |  |  |  |
SafeAuto | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash to acquire businesses |  |  |  |  |  |  |  |  |  | $ 270 |  |  |  |  |
National General Holdings Corp. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 970 |  |  |  |  |  |  |  |  |  |
Purchase accounting fair value adjustment |  |  |  |  |  |  |  |  |  |  | $ 67 |  |  |  |
Amortization of purchased intangibles |  |  |  |  |  | $ 76 |  |  |  |  | 99 |  |  |  |
Amortization expense for the remainder of 2021 |  |  |  |  |  | 152 |  |  |  |  | 152 |  |  |  |
Amortization expense of present value of future profits |  |  |  |  |  | 98 |  |  |  |  | 232 |  |  |  |
Fair value purchase accounting adjustments, increase in reserves |  |  |  |  |  |  |  |  |  |  | 62 |  |  |  |
Fair value purchase accounting adjustments, reduction in investments |  |  |  |  |  |  |  |  |  |  | 13 |  |  |  |
Fair value purchase accounting adjustments, increase in current and deferred tax liabilities |  |  |  |  |  |  |  |  |  |  | 101 |  |  |  |
Business acquisition, transaction costs |  |  |  |  |  | $ 22 |  |  |  |  | $ 22 |  |  |  |
National General Holdings Corp. | Noncumulative Preferred Stock | Series C | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage | 7.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |
National General Holdings Corp. | Depository Shares | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depository shares, as a ratio of preferred stock | 0.025 |  |  |  |  |  |  |  |  |  |  |  |  |  |
National General Holdings Corp. | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense of present value of future profits |  |  |  |  |  |  |  |  |  |  |  |  | $ 85 |  |
National General Holdings Corp. | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life (in years) |  |  |  |  | 3 years |  |  |  |  |  | 6 months |  |  |  |
National General Holdings Corp. | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life (in years) |  |  |  |  | 10 years |  |  |  |  |  | 12 months |  |  |  |
National General Holdings Corp. | Allstate Protection |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 608 |  |  |  |  |  |  |  |  |  |
Present value of future profits |  |  |  |  | 317 |  |  |  |  |  |  |  |  |  |
National General Holdings Corp. | Protection Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | 21 |  |  |  |  |  |  |  |  |  |
National General Holdings Corp. | Allstate Health and Benefits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 341 |  |  |  |  |  |  |  |  |  |

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