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Business Acquisitions - Fair Value of Assets Acquired and Liabilities Assumed at the Acquisition Date (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Nov. 01, 2017
Jul. 30, 2016
Jul. 29, 2016
Sep. 30, 2018
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]                  
Cash           $ 121 $ 180 $ 328 $ 143
Goodwill           1,290 $ 1,290 $ 567  
Aetna Group Insurance [Member]                  
Business Acquisition [Line Items]                  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents $ 3,360         3,405      
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Assets         $ 45        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premiums Receivable 96         103      
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Premiums Receivable         7        
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets 56         69      
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Deferred Income Taxes         13        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles 629         629      
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles         0        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment 68         68      
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment         0        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Reinsurance Recoverables 0         31      
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Reinsurance Recoverables         31        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets 16         0      
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Assets         (16)        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets 4,225         4,305      
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Total Assets       $ 80 80        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Unpaid Losses and Loss Adjustment Expenses 2,833         2,904      
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Unpaid Loss and Loss Adjustment Expenses         71        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed,Liability for Future Policy Benefits 346         347      
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Liability for Future Policy Benefits         1        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Policyholder Benefits 245         246      
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Policyholder Benefits         1        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue 3         4      
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Deferred Revenue         1        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other 69         75      
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Liabilities         6        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities 3,496         3,576      
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Total Liabilities       80 80        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net 729         729      
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Assets and Liabilities, Net         0        
Goodwill 723         723      
Goodwill, Purchase Accounting Adjustments         0        
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net 1,452         $ 1,452      
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Assets Liabilities and Goodwill, Net         0        
Business Acquisition, Goodwill, Expected Tax Deductible Amount       $ 610 $ 610        
Maxum [Member]                  
Business Acquisition [Line Items]                  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents     $ 274            
Cash     12            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles     7            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Reinsurance Recoverables     113            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets     79            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets     477            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Unpaid Losses and Loss Adjustment Expenses     235            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue     77            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other     34            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities     346            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net     131            
Goodwill     38            
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net     169            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill     11            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets     4            
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   10 years              
Lattice [Member]                  
Business Acquisition [Line Items]                  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents     1            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets     12            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities     1            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net     11            
Goodwill     31            
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net     42            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill     11            
Customer Relationships [Member] | Aetna Group Insurance [Member]                  
Business Acquisition [Line Items]                  
Goodwill $ 723                
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 15 years                
Customer Relationships [Member] | Lattice [Member]                  
Business Acquisition [Line Items]                  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets     10            
Other Intangible Assets | Lattice [Member]                  
Business Acquisition [Line Items]                  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles     $ 1            
Other Intangible Assets | Lattice [Member] | Minimum                  
Business Acquisition [Line Items]                  
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life     5 years            
Other Intangible Assets | Lattice [Member] | Maximum [Member]                  
Business Acquisition [Line Items]                  
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life     8 years