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Segment Information - Reconciliation of Financial Measures of Segments to Consolidated Totals (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Revenues | $ 61,397 | $ 45,693
Net investment income | 249 | 50
Total revenues | 61,646 | 45,743
Adjusted Operating Income (Loss) | 3,595 | 2,293
Pharmacy Services Segment [Member] |  |
Revenues | 33,558 | 32,546
Net investment income | 0 | 0
Total revenues | 33,558 | 32,546
Retail Long-Term Care Segment [Member] |  |
Net investment income | 0 | 0
Total revenues | 21,115 | 20,432
Health Care Benefits Segment [Member] |  |
Total revenues | 17,870 | 1,318
Corporate / Other [Member] |  |
Total revenues | 110 | 48
Operating Segments [Member] | Pharmacy Services Segment [Member] |  |
Net Revenues, Retail CoPayments | 3,300 | 3,300
Revenues | 33,558 | 32,546
Total revenues | 33,558 | 32,546
Adjusted Operating Income (Loss) | 947 | 987
Operating Segments [Member] | Retail Long-Term Care Segment [Member] |  |
Revenues | 21,115 | 20,432
Total revenues | 21,115 | 20,432
Adjusted Operating Income (Loss) | 1,489 | 1,836
Operating Segments [Member] | Health Care Benefits Segment [Member] |  |
Revenues | 17,706 | 1,316
Net investment income | 164 | 2
Total revenues | 17,870 | 1,318
Adjusted Operating Income (Loss) | 1,562 | (137)
Operating Segments [Member] | Corporate / Other [Member] |  |
Revenues | 25 | 0
Net investment income | 85 | 48
Total revenues | 110 | 48
Adjusted Operating Income (Loss) | (231) | (218)
Intersegment Eliminations [Member] |  |
Revenues | (11,007) | (8,601)
Net investment income | 0 | 0
Total revenues | (11,007) | (8,601)
Adjusted Operating Income (Loss) | $ (172) | $ (175)

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- Definition Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(2)) -URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263 + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 + Details
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