XML 100 R54.htm IDEA: XBRL DOCUMENT v3.6.0.2
Significant Accounting Policies - Schedule of Premium Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Summarized premium revenue                      
Premium revenue $ 4,177 $ 4,191 $ 4,029 $ 3,995 $ 3,589 $ 3,377 $ 3,304 $ 2,971 $ 16,392 $ 13,241 $ 9,023
Health Plans                      
Summarized premium revenue                      
Premium revenue                 $ 16,392 $ 13,241 $ 9,023
Premium revenue percentage                 100.00% 100.00% 100.00%
Health Plans | California                      
Summarized premium revenue                      
Premium revenue                 $ 2,370 $ 2,200 $ 1,523
Premium revenue percentage                 14.50% 16.60% 16.90%
Health Plans | Florida                      
Summarized premium revenue                      
Premium revenue                 $ 1,926 $ 1,199 $ 439
Premium revenue percentage                 11.70% 9.00% 4.90%
Health Plans | Illinois                      
Summarized premium revenue                      
Premium revenue                 $ 601 $ 397 $ 153
Premium revenue percentage                 3.70% 3.00% 1.70%
Health Plans | Michigan                      
Summarized premium revenue                      
Premium revenue                 $ 1,520 $ 1,067 $ 781
Premium revenue percentage                 9.30% 8.10% 8.70%
Health Plans | New Mexico                      
Summarized premium revenue                      
Premium revenue                 $ 1,304 $ 1,237 $ 1,076
Premium revenue percentage                 7.90% 9.30% 11.90%
Health Plans | New York                      
Summarized premium revenue                      
Premium revenue                 $ 82 $ 0 $ 0
Premium revenue percentage                 0.50% 0.00% 0.00%
Health Plans | Ohio                      
Summarized premium revenue                      
Premium revenue                 $ 1,961 $ 2,034 $ 1,553
Premium revenue percentage                 12.00% 15.40% 17.20%
Health Plans | Puerto Rico                      
Summarized premium revenue                      
Premium revenue                 $ 726 $ 567 $ 0
Premium revenue percentage                 4.40% 4.30% 0.00%
Health Plans | South Carolina                      
Summarized premium revenue                      
Premium revenue                 $ 378 $ 348 $ 381
Premium revenue percentage                 2.30% 2.60% 4.20%
Health Plans | Texas                      
Summarized premium revenue                      
Premium revenue                 $ 2,454 $ 1,961 $ 1,318
Premium revenue percentage                 15.00% 14.80% 14.60%
Health Plans | Utah                      
Summarized premium revenue                      
Premium revenue                 $ 444 $ 331 $ 310
Premium revenue percentage                 2.70% 2.50% 3.40%
Health Plans | Washington                      
Summarized premium revenue                      
Premium revenue                 $ 2,218 $ 1,602 $ 1,305
Premium revenue percentage                 13.50% 12.10% 14.50%
Health Plans | Wisconsin                      
Summarized premium revenue                      
Premium revenue                 $ 395 $ 261 $ 156
Premium revenue percentage                 2.40% 2.00% 1.70%
Health Plans | Direct delivery and other                      
Summarized premium revenue                      
Premium revenue                 $ 13 $ 37 $ 28
Premium revenue percentage                 0.10% 0.30% 0.30%