Quarterly report pursuant to Section 13 or 15(d)

Acquisitions - Schedule of Preliminary Fair Value of Assets Acquired and Liabilities Assumed (Details)

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Acquisitions - Schedule of Preliminary Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Millions
Jul. 01, 2018
Mar. 31, 2019
Dec. 31, 2018
Assets acquired and liabilities assumed      
Goodwill   $ 6,981 $ 7,015
Acquired intangibles, weighted average useful life years 13 years    
Fidelis Care      
Assets acquired and liabilities assumed      
Cash and cash equivalents $ 2,001    
Premium and related receivables 510    
Other current assets 31    
Restricted deposits 495    
Property, software and equipment, net 48    
Intangible assets 956    
Other long-term assets 1    
Total assets acquired 4,042    
Medical claims liability 1,210    
Accounts payable and accrued expenses 258    
Return of premium payable 123    
Unearned revenue 115    
Other long-term liabilities 300    
Total liabilities assumed 2,006    
Total identifiable net assets 2,036    
Goodwill 1,591    
Total assets acquired and liabilities assumed $ 3,627    
Acquired intangibles, weighted average useful life years 13 years    
Fidelis Care | Customer relationships      
Assets acquired and liabilities assumed      
Intangible assets $ 711    
Acquired intangibles, weighted average useful life years 11 years    
Fidelis Care | Trade name      
Assets acquired and liabilities assumed      
Intangible assets $ 196    
Acquired intangibles, weighted average useful life years 20 years    
Fidelis Care | Provider contracts      
Assets acquired and liabilities assumed      
Intangible assets $ 33    
Acquired intangibles, weighted average useful life years 15 years    
Fidelis Care | Developed technologies      
Assets acquired and liabilities assumed      
Intangible assets $ 16    
Acquired intangibles, weighted average useful life years 2 years