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Significant Accounting Policies - Schedule of Premium Revenue (Details) - Health Plans - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule of Premium Revenue by Health Plan Type [Line Items]
Premium revenue percentage	100.00%	100.00%	100.00%
Medical care costs
Schedule of Premium Revenue by Health Plan Type [Line Items]
Premium revenue	$ 17,612	$ 18,854	$ 16,445
California
Schedule of Premium Revenue by Health Plan Type [Line Items]
Premium revenue percentage	12.20%	14.30%	14.40%
California | Medical care costs
Schedule of Premium Revenue by Health Plan Type [Line Items]
Premium revenue	$ 2,150	$ 2,701	$ 2,378
Florida
Schedule of Premium Revenue by Health Plan Type [Line Items]
Premium revenue percentage	10.20%	13.60%	11.80%
Florida | Medical care costs
Schedule of Premium Revenue by Health Plan Type [Line Items]
Premium revenue	$ 1,790	$ 2,568	$ 1,938
Illinois
Schedule of Premium Revenue by Health Plan Type [Line Items]
Premium revenue percentage	4.50%	3.10%	3.70%
Illinois | Medical care costs
Schedule of Premium Revenue by Health Plan Type [Line Items]
Premium revenue	$ 793	$ 593	$ 603
Michigan
Schedule of Premium Revenue by Health Plan Type [Line Items]
Premium revenue percentage	9.10%	8.50%	9.30%
Michigan | Medical care costs
Schedule of Premium Revenue by Health Plan Type [Line Items]
Premium revenue	$ 1,601	$ 1,596	$ 1,527
New Mexico
Schedule of Premium Revenue by Health Plan Type [Line Items]
Premium revenue percentage	7.70%	7.30%	7.90%
New Mexico | Medical care costs
Schedule of Premium Revenue by Health Plan Type [Line Items]
Premium revenue	$ 1,356	$ 1,368	$ 1,305
Ohio
Schedule of Premium Revenue by Health Plan Type [Line Items]
Premium revenue percentage	13.60%	11.80%	12.00%
Ohio | Medical care costs
Schedule of Premium Revenue by Health Plan Type [Line Items]
Premium revenue	$ 2,388	$ 2,216	$ 1,967
Puerto Rico
Schedule of Premium Revenue by Health Plan Type [Line Items]
Premium revenue percentage	3.90%	3.90%	4.40%
Puerto Rico | Medical care costs
Schedule of Premium Revenue by Health Plan Type [Line Items]
Premium revenue	$ 696	$ 732	$ 726
South Carolina
Schedule of Premium Revenue by Health Plan Type [Line Items]
Premium revenue percentage	2.80%	2.40%	2.30%
South Carolina | Medical care costs
Schedule of Premium Revenue by Health Plan Type [Line Items]
Premium revenue	$ 495	$ 445	$ 378
Texas
Schedule of Premium Revenue by Health Plan Type [Line Items]
Premium revenue percentage	18.40%	14.90%	15.00%
Texas | Medical care costs
Schedule of Premium Revenue by Health Plan Type [Line Items]
Premium revenue	$ 3,244	$ 2,813	$ 2,461
Washington
Schedule of Premium Revenue by Health Plan Type [Line Items]
Premium revenue percentage	13.40%	13.80%	13.50%
Washington | Medical care costs
Schedule of Premium Revenue by Health Plan Type [Line Items]
Premium revenue	$ 2,361	$ 2,608	$ 2,222
Other
Schedule of Premium Revenue by Health Plan Type [Line Items]
Premium revenue percentage	4.20%	6.40%	5.70%
Other | Medical care costs
Schedule of Premium Revenue by Health Plan Type [Line Items]
Premium revenue	$ 738	$ 1,214	$ 940

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

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