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Acquisitions (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2019
May 31, 2019
Dec. 31, 2019
Dec. 31, 2021
Dec. 31, 2018
Huatai Group [Member]          
Investment [Line Items]          
Equity method investment, additional ownership percentage obtained 4.70%        
Ownership Percentage 30.90%   30.90%   20.00%
Huatai Group [Member] | CHINA          
Investment [Line Items]          
Payments to Acquire Equity Method Investments $ 251 $ 329      
Equity method investment, additional ownership percentage obtained   6.20%      
Ownership Percentage 31.00%   31.00%   20.00%
Huatai Group [Member] | Subsequent Event [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%  
Amount agreed to acquire 22.4 percent of Huatai Group       $ 1,600  
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions       53.30%  
Banchile Seguros de Vida [Member]          
Investment [Line Items]          
Payments to Acquire Businesses, Gross     $ 80