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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Revenues From Third Party Payers [Line Items]        
Revenues from third party payers $ 14,435 $ 11,068 $ 28,412 $ 23,929
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 $ 2,612 $ 2,272 $ 5,171 $ 5,015
Revenues from third party payers, Ratio 18.10% 20.50% 18.20% 21.00%
Managed Medicare [Member]        
Revenues From Third Party Payers [Line Items]        
Revenues from third party payers $ 2,104 $ 1,488 $ 4,157 $ 3,314
Revenues from third party payers, Ratio 14.60% 13.40% 14.60% 13.80%
Medicaid [Member]        
Revenues From Third Party Payers [Line Items]        
Revenues from third party payers $ 503 $ 564 $ 1,030 $ 978
Revenues from third party payers, Ratio 3.50% 5.10% 3.60% 4.10%
Managed Medicaid [Member]        
Revenues From Third Party Payers [Line Items]        
Revenues from third party payers $ 831 $ 531 $ 1,556 $ 1,197
Revenues from third party payers, Ratio 5.80% 4.80% 5.50% 5.00%
Managed Care and Insurers [Member]        
Revenues From Third Party Payers [Line Items]        
Revenues from third party payers $ 7,417 $ 5,631 $ 14,302 $ 12,276
Revenues from third party payers, Ratio 51.30% 50.90% 50.40% 51.40%
International (managed care and insurers) [Member]        
Revenues From Third Party Payers [Line Items]        
Revenues from third party payers $ 338 $ 239 $ 671 $ 531
Revenues from third party payers, Ratio 2.30% 2.20% 2.40% 2.20%
Other [Member]        
Revenues From Third Party Payers [Line Items]        
Revenues from third party payers $ 630 $ 343 $ 1,525 $ 618
Other, Ratio 4.40% 3.10% 5.30% 2.50%