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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, 2018 | Mar. 31, 2017
Revenues From Third Party Payers [Line Items] |  |
Other | $ 291 | $ 304
Revenues | $ 11,423 | $ 10,623
Other, Ratio | 2.40% | 3.00%
Revenues ratio from third party payers | 100.00% | 100.00%
Medicare [Member] |  |
Revenues From Third Party Payers [Line Items] |  |
Revenues from third party payers | $ 2,524 | $ 2,361
Revenues from third party payers, Ratio | 22.10% | 22.20%
Managed Medicare [Member] |  |
Revenues From Third Party Payers [Line Items] |  |
Revenues from third party payers | $ 1,399 | $ 1,183
Revenues from third party payers, Ratio | 12.30% | 11.10%
Medicaid [Member] |  |
Revenues From Third Party Payers [Line Items] |  |
Revenues from third party payers | $ 281 | $ 294
Revenues from third party payers, Ratio | 2.50% | 2.80%
Managed Medicaid [Member] |  |
Revenues From Third Party Payers [Line Items] |  |
Revenues from third party payers | $ 561 | $ 589
Revenues from third party payers, Ratio | 4.90% | 5.50%
Managed Care and Insurers [Member] |  |
Revenues From Third Party Payers [Line Items] |  |
Revenues from third party payers | $ 6,062 | $ 5,623
Revenues from third party payers, Ratio | 53.10% | 52.90%
International (Managed Care and Other Insurers) [Member] |  |
Revenues From Third Party Payers [Line Items] |  |
Revenues from third party payers | $ 305 | $ 269
Revenues from third party payers, Ratio | 2.70% | 2.50%

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- Definition Amount of revenue recognized for providing services to patients, net of provisions for contractual allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 605 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68054470&loc=d3e8184-115640 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 605 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=68054470&loc=d3e8195-115640 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 605 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68054470&loc=SL9156442-115640 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 605 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68052803&loc=SL9156464-115641 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 605 -Section 45 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68054470&loc=SL9156442-115640 + Details
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