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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%