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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Revenues From Third Party Payers [Line Items]        
Revenues from third party payers $ 11,068 $ 12,602 $ 23,929 $ 25,119
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 $ 2,272 $ 2,635 $ 5,015 $ 5,405
Revenues from third party payers, Ratio 20.50% 20.90% 21.00% 21.50%
Managed Medicare [Member]        
Revenues From Third Party Payers [Line Items]        
Revenues from third party payers $ 1,488 $ 1,595 $ 3,314 $ 3,184
Revenues from third party payers, Ratio 13.40% 12.70% 13.80% 12.70%
Medicaid [Member]        
Revenues From Third Party Payers [Line Items]        
Revenues from third party payers $ 564 $ 416 $ 978 $ 763
Revenues from third party payers, Ratio 5.10% 3.30% 4.10% 3.00%
Managed Medicaid [Member]        
Revenues From Third Party Payers [Line Items]        
Revenues from third party payers $ 531 $ 554 $ 1,197 $ 1,167
Revenues from third party payers, Ratio 4.80% 4.40% 5.00% 4.60%
Managed Care and Other Insurers [Member]        
Revenues From Third Party Payers [Line Items]        
Revenues from third party payers $ 5,631 $ 6,425 $ 12,276 $ 12,851
Revenues from third party payers, Ratio 50.90% 50.90% 51.40% 51.10%
International (Managed Care and Other Insurers) [Member]        
Revenues From Third Party Payers [Line Items]        
Revenues from third party payers $ 239 $ 284 $ 531 $ 581
Revenues from third party payers, Ratio 2.20% 2.30% 2.20% 2.30%
Product and Service, Other [Member]        
Revenues From Third Party Payers [Line Items]        
Revenues from third party payers $ 343 $ 693 $ 618 $ 1,168
Other, Ratio 3.10% 5.50% 2.50% 4.80%