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Basis of Presentation and Significant Accounting Policies - Schedule of Revenues from Third Party Payers, Uninsured and Other Payers (Detail) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Revenues From Third Party Payers [Line Items] |  |
Revenues from third party payers | $ 12,861 | $ 12,517
Revenues ratio from third party payers | 100.00% | 100.00%
Medicare [Member] |  |
Revenues From Third Party Payers [Line Items] |  |
Revenues from third party payers | $ 2,743 | $ 2,770
Revenues from third party payers, Ratio | 21.30% | 22.10%
Managed Medicare [Member] |  |
Revenues From Third Party Payers [Line Items] |  |
Revenues from third party payers | $ 1,826 | $ 1,589
Revenues from third party payers, Ratio | 14.20% | 12.70%
Medicaid [Member] |  |
Revenues From Third Party Payers [Line Items] |  |
Revenues from third party payers | $ 414 | $ 347
Revenues from third party payers, Ratio | 3.20% | 2.80%
Managed Medicaid [Member] |  |
Revenues From Third Party Payers [Line Items] |  |
Revenues from third party payers | $ 666 | $ 613
Revenues from third party payers, Ratio | 5.20% | 4.90%
Managed Care and Other Insurers [Member] |  |
Revenues From Third Party Payers [Line Items] |  |
Revenues from third party payers | $ 6,645 | $ 6,426
Revenues from third party payers, Ratio | 51.60% | 51.40%
International (Managed Care and Other Insurers) [Member] |  |
Revenues From Third Party Payers [Line Items] |  |
Revenues from third party payers | $ 292 | $ 297
Revenues from third party payers, Ratio | 2.30% | 2.40%
Product and Service, Other [Member] |  |
Revenues From Third Party Payers [Line Items] |  |
Revenues from third party payers | $ 275 | $ 475
Other, Ratio | 2.20% | 3.70%

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- Definition Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 + Details
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