Quarterly report pursuant to Section 13 or 15(d)

Organization and Operations (Details)

v3.8.0.1
Organization and Operations (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 24, 2016
Sep. 30, 2016
Sep. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Decrease to income tax expense due to adoption of ASU 2016-09   $ 2 $ 4
Health Net, Inc.      
Business Acquisition [Line Items]      
Business combination, consideration transferred, including assumed debt $ 6,000