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Acquisitions (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Investment [Line Items] |  |  |  |  |
Payment, including deposit, for Huatai Group Interest |  |  | $ 1,623 | $ 580 |
Banchile Seguros de Vida [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Payments to Acquire Businesses, Gross | $ 74 |  |  |  |
Huatai Group [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Ownership Percentage | 47.10% |  | 47.10% |  |
Huatai Group [Member] | CHINA |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Equity method investment, additional 7.1 percentage obtained |  |  | 7.10% |  |
Portion two of payments to acquire equity method investments |  |  | $ 493 |  |
Portion one of payments to acquire equity method investments |  |  |  | $ 1,100 |
Equity method investment, additional 15.3 ownership percentage obtained |  |  |  | 15.30% |
Equity method investment, additional 22.4 ownership percentage obtained |  |  |  | 22.40% |
Ownership Percentage | 47.00% |  | 47.00% | 31.00% |
Equity method investment, incremental 0.9 percent obtained | 0.90% |  |  |  |
Purchase of incremental ownership interest | $ 65 |  |  |  |
Payment, including deposit, for Huatai Group Interest |  |  | $ 1,623 | $ 580 | $ 0
Huatai Group [Member] | Subsequent Event [Member] | CHINA |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Equity method investment, additional 7.1 percentage obtained |  | 7.10% |  |  |

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