XML 28 R36.htm IDEA: XBRL DOCUMENT v3.20.1
General - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Allowance for Credit Loss $ 365 $ 289        
Stockholders' equity (24,173)   $ (25,998) $ (23,418)    
Premium installment receivables 96 91        
Credit Loss expense 42          
Writeoffs 37          
Retained income            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Cumulative effect of change in accounting principle   (88)     $ 21  
Stockholders' equity $ (48,326)   $ (48,074) $ (45,148)   $ (44,033)
Minimum | Retained income | Accounting Standards Update 2016-13            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Cumulative effect of change in accounting principle   $ (88)