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Debt - Debt (Details) - USD ($)
3 Months Ended 9 Months Ended
Mar. 29, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jul. 19, 2018
Jun. 15, 2018
Mar. 15, 2018
Debt Instruments [Line Items]                
Long-term Debt, Gross               $ 500,000,000
Proceeds from Debt, Net of Issuance Costs       $ 490,000,000        
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed       100.00%        
Debt Instrument, Interest Rate, Increase (Decrease)       25.00%        
Gain (Loss) on Extinguishment of Debt   $ 0 $ 0 $ (6,000,000) $ 0      
Line of Credit Facility, Covenant Terms - Monetary $ 9,000,000,000              
Letters of Credit, Maximum Borrowing Capacity   100,000,000   100,000,000        
Line of Credit Facility, Remaining Borrowing Capacity   0   0        
Commercial Paper   0   0        
Letters of Credit Outstanding, Amount   3,000,000   3,000,000        
Federal Home Loan Bank, Advances, Affordable Housing Program, Principal Outstanding   0   0        
Revolving Credit Facility                
Debt Instruments [Line Items]                
Line of Credit Facility, Maximum Amount Outstanding During Period       $ 750,000,000        
Line of Credit Facility, Covenant Terms - Percent       35.00%        
Revolving Credit Facility | Scenario, Adjustment [Member]                
Debt Instruments [Line Items]                
Line of Credit Facility, Maximum Borrowing Capacity   1,000,000,000   $ 1,000,000,000        
Commercial Paper [Member]                
Debt Instruments [Line Items]                
Line of Credit Facility, Maximum Borrowing Capacity           $ 750    
Commercial Paper [Member] | Scenario, Adjustment [Member]                
Debt Instruments [Line Items]                
Line of Credit Facility, Maximum Borrowing Capacity   1,000,000,000   1,000,000,000        
Previously Reported [Member]                
Debt Instruments [Line Items]                
Line of Credit Facility, Covenant Terms - Monetary       13,500,000,000        
Letters of Credit, Maximum Borrowing Capacity   250,000,000   $ 250,000,000        
4.4% Notes, due 2048                
Debt Instruments [Line Items]                
Interest rate               4.40%
6.3% Notes, due 2018 | Senior Notes                
Debt Instruments [Line Items]                
Interest rate               6.30%
Repayment of debt               $ 320,000,000
8.125% Notes, due 2068                
Debt Instruments [Line Items]                
Interest rate             8.125%  
Debt Instrument, Face Amount             $ 500,000,000  
3 month Libor 2.125% Notes due 2067 | LIBOR                
Debt Instruments [Line Items]                
Variable Interest Rate       2.125%        
Hartford Fire Insurance Company [Member]                
Debt Instruments [Line Items]                
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances   1,300,000,000   $ 1,300,000,000        
Hartford Life and Accident Insurance Company [Member]                
Debt Instruments [Line Items]                
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances   $ 500,000,000   $ 500,000,000