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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, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Revenues From Third Party Payers [Line Items]        
Revenues $ 19,161 $ 17,487 $ 56,087 $ 52,318
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 $ 2,728 $ 2,584 $ 8,426 $ 8,043
Revenues from third party payers, Ratio 14.20% 14.80% 15.00% 15.40%
Managed Medicare [Member]        
Revenues From Third Party Payers [Line Items]        
Revenues from third party payers $ 3,306 $ 2,949 $ 9,957 $ 8,888
Revenues from third party payers, Ratio 17.30% 16.90% 17.80% 17.00%
Medicaid [Member]        
Revenues From Third Party Payers [Line Items]        
Revenues from third party payers $ 1,783 $ 1,127 $ 4,413 $ 3,316
Revenues from third party payers, Ratio 9.30% 6.40% 7.90% 6.30%
Managed Medicaid [Member]        
Revenues From Third Party Payers [Line Items]        
Revenues from third party payers $ 949 $ 1,031 $ 2,727 $ 3,042
Revenues from third party payers, Ratio 4.90% 5.90% 4.90% 5.80%
Managed Care and Insurers [Member]        
Revenues From Third Party Payers [Line Items]        
Revenues from third party payers $ 9,267 $ 8,497 $ 27,432 $ 25,591
Revenues from third party payers, Ratio 48.40% 48.60% 48.80% 49.00%
International (Managed Care and Insurers) [Member]        
Revenues From Third Party Payers [Line Items]        
Revenues from third party payers $ 484 $ 424 $ 1,390 $ 1,252
Revenues from third party payers, Ratio 2.50% 2.40% 2.50% 2.40%
Other [Member]        
Revenues From Third Party Payers [Line Items]        
Revenues $ 644 $ 875 $ 1,742 $ 2,186
Other, Ratio 3.40% 5.00% 3.10% 4.10%