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Segment Information - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Mar. 31, 2021
Mar. 31, 2020
Segment Reporting Information [Line Items]        
Unearned voluntary protection contract revenues   $ 2,300    
Unearned amounts in voluntary protection contract revenues, recognized $ 192 $ 188    
Other liabilities [Member]        
Segment Reporting Information [Line Items]        
Unearned voluntary protection contract revenues $ 2,500   $ 2,500 $ 2,400
Accounting Standards Update 2014-09 [Member]        
Segment Reporting Information [Line Items]        
Percentage of voluntary protection contract revenues 82.00% 83.00%