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Acquisitions and Sale of Businesses - Narrative on sale of businesses (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Jun. 30, 2020
Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Proceeds from sale of businesses     $ 3,581 $ 3 $ 0  
Realized gains on subsidiaries     4 23 0  
Income tax expense (benefit)     $ 254 25 $ 143  
Neon Capital Limited            
Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Proceeds from sale of businesses $ 10     $ 6    
Carrying value of assets and liabilities disposed, percentage of total assets and liabilities   1.00%   1.00%    
Realized gains on subsidiaries $ 4 $ 23   $ 23    
Income tax expense (benefit)       $ (72)    
Neon Capital Limited Executives | Neon Capital Limited            
Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Percent of noncontrolling interest acquired from former and current Neon executives           100.00%