Quarterly report pursuant to Section 13 or 15(d)

Segment Information (Details)

v3.20.1
Segment Information (Details)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2019
segment
Segment Reporting [Abstract]      
Number of operating segments | segment     2
Segment Reporting Information [Line Items]      
Total revenues $ 26,025 $ 18,444  
Earnings from operations 188 685  
Eliminations      
Segment Reporting Information [Line Items]      
Total revenues (2,914) (2,484)  
Earnings from operations 0    
Managed Care      
Segment Reporting Information [Line Items]      
Total revenues 25,036 17,722  
Earnings from operations 217 615  
Managed Care | Operating Segments      
Segment Reporting Information [Line Items]      
Total revenues 24,936 17,687  
Managed Care | Eliminations      
Segment Reporting Information [Line Items]      
Total revenues 100 35  
Specialty Services      
Segment Reporting Information [Line Items]      
Total revenues 3,903 3,206  
Earnings from operations (29) 70  
Specialty Services | Operating Segments      
Segment Reporting Information [Line Items]      
Total revenues 1,089 757  
Specialty Services | Eliminations      
Segment Reporting Information [Line Items]      
Total revenues $ 2,814 $ 2,449