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Divestitures and Asset Sales (Details)
member in Thousands, $ in Millions
3 Months Ended 6 Months Ended
Jun. 01, 2022
USD ($)
Jun. 30, 2022
USD ($)
Mar. 31, 2022
USD ($)
member
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
May 31, 2022
member
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Gain (loss) on divestiture, pretax   $ 225   $ 0 $ 225 $ 0  
Loss on assets held for sale   0   $ 0 41 $ 0  
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Payflex | Health Care Benefits              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Proceeds from divestiture of subsidiary $ 775            
Gain (loss) on divestiture, pretax   $ 225     225    
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Thailand Business | Health Care Benefits              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Number of medical members | member     266        
Loss on assets held for sale     $ 41   $ 41    
Disposal Group, Disposed of by Sale, Not Discontinued Operations | International Health Care Renewal Rights              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Number of international health care members, renewal rights sold | member             200
Member migration period             16 months