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Additional Trans with Brighthouse - Investment and Debt (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Jul. 21, 2017
Jun. 30, 2017
Apr. 30, 2017
Line of Credit Facility [Line Items]          
Discontinued Operation, Intra-Entity Amounts, Discontinued Operation after Disposal, Revenue $ 18 $ 18      
Brighthouse Financial, Inc          
Line of Credit Facility [Line Items]          
Revenue from Related Parties 8 57      
Line of Credit Facility, Maximum Borrowing Capacity     $ 600 $ 536 $ 3,000
Brighthouse Financial, Inc | Committed Credit Facility Six [Member]          
Line of Credit Facility [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity 2,900 2,900      
Letters of Credit Outstanding, Amount $ 2,300 $ 2,300