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Subsequent Events (Details) - USD ($)
$ in Millions
12 Months Ended
Feb. 01, 2019
Dec. 02, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Feb. 26, 2019
Feb. 15, 2019
Jul. 21, 2017
Subsequent Event [Line Items]                
Long-term debt issued     $ 375 $ 3,588 $ 0      
Long-term debt repaid     9 $ 13 $ 26      
BHF Term Loan Due 2019                
Subsequent Event [Line Items]                
Credit facilities, maximum borrowing capacity   $ 3,000           $ 600
Credit facilities, term   3 years            
Credit facilities, outstanding balance     $ 600          
Subsequent Event | BHF Term Loan Due 2024                
Subsequent Event [Line Items]                
Credit facilities, maximum borrowing capacity $ 1,000              
Credit facilities, term 5 years              
Long-term debt issued $ 1,000              
Subsequent Event | BHF Term Loan Due 2019                
Subsequent Event [Line Items]                
Long-term debt repaid $ 600              
Subsequent Event | Farmer Mac Funding Agreements                
Subsequent Event [Line Items]                
Credit facilities, maximum borrowing capacity             $ 500  
Credit facilities, outstanding balance           $ 0