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Medical Claims Liability - Cumulative incurred and Paid Claims (Details) - Health insurance product line - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Claims Development [Line Items] |  |  |
Short-duration insurance contracts, incurred claims and allocated claim adjustment expense, net | $ 139,937 |  |
Short-duration insurance contracts, cumulative paid claims and allocated claim adjustment expense, net | 133,133 |  |
Short-duration insurance contracts, liability for unpaid claims and allocated claim adjustment expense, net, not separately presented | 6,804 |  |
Short-duration insurance contracts, accident year 2016 |  |  |
Claims Development [Line Items] |  |  |
Short-duration insurance contracts, incurred claims and allocated claim adjustment expense, net | 41,890 | $ 41,947 | $ 42,512
Short-duration insurance contracts, cumulative paid claims and allocated claim adjustment expense, net | 41,803 | 41,679 | $ 37,876
Short-duration insurance contracts, accident year 2017 |  |  |
Claims Development [Line Items] |  |  |
Short-duration insurance contracts, incurred claims and allocated claim adjustment expense, net | 46,738 | 47,310 |
Short-duration insurance contracts, cumulative paid claims and allocated claim adjustment expense, net | 46,512 | $ 41,972 |
Short-duration insurance contracts, accident year 2018 |  |  |
Claims Development [Line Items] |  |  |
Short-duration insurance contracts, incurred claims and allocated claim adjustment expense, net | 51,309 |  |
Short-duration insurance contracts, cumulative paid claims and allocated claim adjustment expense, net | $ 44,818 |  |

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- Definition Amount, after reinsurance, of paid claims and allocated claim adjustment expense used in claims development for short-duration insurance contracts. Excludes unallocated claim adjustment expense. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99384497&loc=SL65671311-158438 + Details
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- Definition Undiscounted amount, after reinsurance, of incurred claims and allocated claim adjustment expense used in claims development for short-duration insurance contracts. Excludes unallocated claim adjustment expense. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99384497&loc=SL65671311-158438 + Details
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- Definition Undiscounted amount, after reinsurance, of the liability for unpaid claims and allocated claim adjustment expense for short-duration insurance contracts for accident years not separately presented in claim development information. Excludes unallocated claim adjustment expense. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=99384497&loc=SL65671311-158438 + Details
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