Quarterly report pursuant to Section 13 or 15(d)

Segment Information (Details)

v3.5.0.2
Segment Information (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
segment
Sep. 30, 2015
USD ($)
Segment Reporting [Abstract]        
Number of operating segments | segment     2  
Segment Reporting Information [Line Items]        
Total revenues $ 10,846 $ 5,821 $ 28,696 $ 16,458
Earnings from operations 342 183 739 485
Managed Care        
Segment Reporting Information [Line Items]        
Total revenues 10,010 5,278 26,439 14,857
Earnings from operations 304 138 618 358
Specialty Services        
Segment Reporting Information [Line Items]        
Total revenues 836 543 2,257 1,601
Earnings from operations 38 45 121 127
Operating Segments | Managed Care        
Segment Reporting Information [Line Items]        
Total revenues 10,065 5,301 26,582 14,930
Operating Segments | Specialty Services        
Segment Reporting Information [Line Items]        
Total revenues 2,361 1,817 6,641 5,126
Eliminations        
Segment Reporting Information [Line Items]        
Total revenues (1,580) (1,297) (4,527) (3,598)
Eliminations | Managed Care        
Segment Reporting Information [Line Items]        
Total revenues 55 23 143 73
Eliminations | Specialty Services        
Segment Reporting Information [Line Items]        
Total revenues $ 1,525 $ 1,274 $ 4,384 $ 3,525