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Separation of Brighthouse (Additional Trans with Brighthouse - Investment and Debt) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Line of Credit Facility [Line Items]        
Discontinued Operation after Disposal, Revenue $ 32   $ 61  
Brighthouse Financial, Inc        
Line of Credit Facility [Line Items]        
Revenue from Related Parties   $ 24   $ 49
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 $ 2,400   $ 2,400