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General - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Apr. 01, 2020
Mar. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Jun. 30, 2019
Apr. 01, 2019
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Allowance for Credit Loss $ 413 $ 413   $ 365 $ 289            
Stockholders' equity (26,986) (26,986)       $ (25,998) $ (24,476)        
Premium installment receivables 139 139   96 91 91          
Credit Loss expense 94 136                  
Writeoffs 51 88                  
Retained income                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Stockholders' equity $ (49,380) $ (49,380)   $ (48,326)   $ (48,074) $ (45,803)   $ (45,148)   $ (44,033)
Cumulative effect of change in accounting principle | Retained income                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Stockholders' equity     $ 0   88     $ 0   $ (21)  
Cumulative effect of change in accounting principle | Minimum | Retained income | Accounting Standards Update 2016-13                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Stockholders' equity         $ (88)