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Acquisitions Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Nov. 28, 2018
Fair Value of Assets Acquired and Liabilities Assumed      
Goodwill $ 79,075 $ 78,678  
Aetna Inc. [Member]      
Fair Value of Assets Acquired and Liabilities Assumed      
Cash and cash equivalents     $ 6,565
Accounts Receivable     4,089
Other current assets     3,896
Investments (current and long-term)     17,984
Goodwill     47,082
Intangible assets     23,086
Other long-term assets     8,249
Total assets acquired     110,951
Health care costs payable     5,293
Other current liabilities     9,982
Debt (current and long-term)     8,098
Deferred income taxes     4,414
Other long-term liabilities     13,078
Total liabilities assumed     40,865
Noncontrolling interests     320
Total consideration transferred     $ 69,766