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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Revenues From Third Party Payers [Line Items] |  |  |  |
Revenues from third party payers | $ 10,911 | $ 10,402 | $ 21,728 | $ 20,815
Uninsured | 519 | 225 | 744 | 414
Other | 376 | 454 | 717 | 902
Revenues before provision for doubtful accounts | 11,806 | 11,081 | 23,189 | 22,131
Provision for doubtful accounts | (1,073) | (762) | (1,833) | (1,552)
Revenues | $ 10,733 | $ 10,319 | $ 21,356 | $ 20,579
Revenues from third party payers, Ratio | 101.70% | 100.70% | 101.70% | 101.20%
Uninsured, Ratio | 4.80% | 2.20% | 3.50% | 2.00%
Other, Ratio | 3.50% | 4.40% | 3.40% | 4.40%
Revenues before provision for doubtful accounts, Ratio | 110.00% | 107.30% | 108.60% | 107.60%
Provision for doubtful accounts, Ratio | (10.00%) | (7.30%) | (8.60%) | (7.60%)
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 | $ 2,321 | $ 2,217 | $ 4,726 | $ 4,483
Revenues from third party payers, Ratio | 21.60% | 21.50% | 22.10% | 21.80%
Managed Medicare [Member] |  |  |  |
Revenues From Third Party Payers [Line Items] |  |  |  |
Revenues from third party payers | $ 1,187 | $ 1,078 | $ 2,390 | $ 2,182
Revenues from third party payers, Ratio | 11.10% | 10.40% | 11.20% | 10.60%
Medicaid [Member] |  |  |  |
Revenues From Third Party Payers [Line Items] |  |  |  |
Revenues from third party payers | $ 453 | $ 416 | $ 826 | $ 843
Revenues from third party payers, Ratio | 4.20% | 4.00% | 3.90% | 4.10%
Managed Medicaid [Member] |  |  |  |
Revenues From Third Party Payers [Line Items] |  |  |  |
Revenues from third party payers | $ 575 | $ 608 | $ 1,216 | $ 1,205
Revenues from third party payers, Ratio | 5.40% | 5.90% | 5.70% | 5.90%
Managed Care and Other Insurers [Member] |  |  |  |
Revenues From Third Party Payers [Line Items] |  |  |  |
Revenues from third party payers | $ 6,106 | $ 5,759 | $ 12,032 | $ 11,461
Revenues from third party payers, Ratio | 56.90% | 55.80% | 56.30% | 55.70%
International (Managed Care and Other Insurers) [Member] |  |  |  |
Revenues From Third Party Payers [Line Items] |  |  |  |
Revenues from third party payers | $ 269 | $ 324 | $ 538 | $ 641
Revenues from third party payers, Ratio | 2.50% | 3.10% | 2.50% | 3.10%

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