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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Revenues From Third Party Payers [Line Items] |  |  |  |
Revenues from third party payers | $ 10,769 | $ 10,390 | $ 32,497 | $ 31,205
Uninsured | 849 | 336 | 1,593 | 750
Other | 349 | 384 | 1,066 | 1,286
Revenues before provision for doubtful accounts | 11,967 | 11,110 | 35,156 | 33,241
Provision for doubtful accounts | (1,271) | (840) | (3,104) | (2,392)
Revenues | $ 10,696 | $ 10,270 | $ 32,052 | $ 30,849
Revenues from third party payers, Ratio | 100.60% | 101.20% | 101.40% | 101.10%
Uninsured, Ratio | 7.90% | 3.30% | 5.00% | 2.40%
Other, Ratio | 3.30% | 3.70% | 3.30% | 4.20%
Revenues before provision for doubtful accounts, Ratio | 111.80% | 108.20% | 109.70% | 107.70%
Provision for doubtful accounts, Ratio | (11.80%) | (8.20%) | (9.70%) | (7.70%)
Revenues ratio from third party payers | 100.00% | 100.00% | 100.00% | 100.00%
Medicare [Member] |  |  |  |
Revenues From Third Party Payers [Line Items] |  |  |  |
Revenues from third party payers | $ 2,354 | $ 2,158 | $ 7,080 | $ 6,641
Revenues from third party payers, Ratio | 22.00% | 21.00% | 22.10% | 21.50%
Managed Medicare [Member] |  |  |  |
Revenues From Third Party Payers [Line Items] |  |  |  |
Revenues from third party payers | $ 1,156 | $ 1,068 | $ 3,546 | $ 3,250
Revenues from third party payers, Ratio | 10.80% | 10.40% | 11.10% | 10.50%
Medicaid [Member] |  |  |  |
Revenues From Third Party Payers [Line Items] |  |  |  |
Revenues from third party payers | $ 362 | $ 405 | $ 1,188 | $ 1,248
Revenues from third party payers, Ratio | 3.40% | 3.90% | 3.70% | 4.00%
Managed Medicaid [Member] |  |  |  |
Revenues From Third Party Payers [Line Items] |  |  |  |
Revenues from third party payers | $ 582 | $ 611 | $ 1,798 | $ 1,816
Revenues from third party payers, Ratio | 5.40% | 6.00% | 5.60% | 5.90%
Managed Care and Other Insurers [Member] |  |  |  |
Revenues From Third Party Payers [Line Items] |  |  |  |
Revenues from third party payers | $ 6,039 | $ 5,863 | $ 18,071 | $ 17,324
Revenues from third party payers, Ratio | 56.40% | 57.10% | 56.40% | 56.20%
International (Managed Care and Other Insurers) [Member] |  |  |  |
Revenues From Third Party Payers [Line Items] |  |  |  |
Revenues from third party payers | $ 276 | $ 285 | $ 814 | $ 926
Revenues from third party payers, Ratio | 2.60% | 2.80% | 2.50% | 3.00%

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