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Long-term and Short-term Debt (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 2 Months Ended 3 Months Ended 10 Months Ended 12 Months Ended
Jun. 26, 2018
Dec. 31, 2018
Aug. 31, 2018
Dec. 31, 2017
Jun. 30, 2018
Oct. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Nov. 01, 2017
Aug. 02, 2017
Jul. 21, 2017
Jun. 30, 2017
Apr. 30, 2017
Dec. 11, 2015
Debt Instrument [Line Items]                              
Other Short-term Borrowings   $ 169   $ 377     $ 169 $ 377              
Short-term Debt, Weighted Average Interest Rate, at Point in Time   3.02%   2.41%     3.02% 2.41% 1.32%            
Debt Instrument, Face Amount   $ 3,200   $ 3,200     $ 3,200 $ 3,200              
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net   87   95     87 95              
Long Term Debt Aggregate Maturities, Year One   2         2                
Long Term Debt Aggregate Maturities, Year Two   512         512                
Long Term Debt Aggregate Maturities, Year Three   368         368                
Long Term Debt Aggregate Maturities, Year Four   797         797                
Long Term Debt Aggregate Maturities, Year Five   1,000         1,000                
Long-term Debt, Maturities, Repayments of Principal after Year Five   10,100         10,100                
Reduction of long-term debt             944 0 $ 0            
Interest Expense, Debt             827 841 874            
Redemption Premium   18         30                
Investment Banking, Advisory, Brokerage, and Underwriting Fees and Commissions             37                
Repayments of Long-term Debt             1,871 1,073 $ 1,279            
Senior notes                              
Debt Instrument [Line Items]                              
Long-term Debt, Gross   $ 11,923   14,685     $ 11,923 14,685              
Debt Instrument, Maturity Date             Jun. 30, 2035                
Debt Instrument, Interest Rate, Stated Percentage   5.70%         5.70%                
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net   $ 79   86     $ 79 86              
Other Notes MPEH [Member]                              
Debt Instrument [Line Items]                              
Debt Instrument, Face Amount                             $ 350
Line of Credit Facility, Maximum Borrowing Capacity   75         $ 75                
Debt Instrument, Interest Rate Terms           three-month LIBOR plus 3.70% three-month LIBOR plus 3.10%                
Debt Issuance Costs, Gross                             6
Repayments of Long-term Debt             $ 50                
Other Notes [Member]                              
Debt Instrument [Line Items]                              
Long-term Debt, Gross   477   578     477 578              
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net   4   $ 4     4 4              
Principal1035MaturityAugust2018 [Member]                              
Debt Instrument [Line Items]                              
Debt Instrument, Face Amount   $ 1,035         $ 1,035                
Debt Instrument, Interest Rate, Stated Percentage   6.817%         6.817%                
Early Repayment of Senior Debt $ 160                            
Reduction of long-term debt             $ 343                
Amendment [Member] | Other Notes MPEH [Member]                              
Debt Instrument [Line Items]                              
Debt Instrument, Maturity Date       Nov. 15, 2022                      
Line of Credit Facility, Maximum Borrowing Capacity                   $ 75         $ 100
Debt Instrument, Interest Rate Terms       three-month London Interbank Offered Rate (“LIBOR”) plus 3.25%                      
Debt Issuance Costs, Gross                   $ 1          
Principal1035MaturityFebruary2019 [Member]                              
Debt Instrument [Line Items]                              
Debt Instrument, Face Amount   $ 1,035         $ 1,035                
Debt Instrument, Interest Rate, Stated Percentage   7.717%         7.717%                
Early Repayment of Senior Debt     $ 566                        
Reduction of long-term debt             $ 469                
Redemption Premium             14                
Principal1000MaturityFebruary2021 [Member]                              
Debt Instrument [Line Items]                              
Debt Instrument, Face Amount   $ 1,000         $ 1,000                
Debt Instrument, Interest Rate, Stated Percentage   4.75%         4.75%                
Early Repayment of Senior Debt   $ 500                          
Reduction of long-term debt             $ 132                
Securities Sold under Agreements to Repurchase [Member]                              
Debt Instrument [Line Items]                              
Other Short-term Borrowings   169   $ 374     169 374              
Affiliated Entity [Member] | Other Notes [Member]                              
Debt Instrument [Line Items]                              
Long-term Debt, Gross   139         139                
Brighthouse Financial, Inc                              
Debt Instrument [Line Items]                              
Debt Instrument, Face Amount                     $ 500        
Line of Credit Facility, Maximum Borrowing Capacity                       $ 600 $ 536 $ 3,000  
Reduction of long-term debt         $ 944                    
Committed Credit Facility Six [Member]                              
Debt Instrument [Line Items]                              
Letters of Credit Outstanding, Amount   2,420         2,420                
Line of Credit Facility, Maximum Borrowing Capacity   2,896         2,896                
Committed Credit Facility Six [Member] | Brighthouse Financial, Inc                              
Debt Instrument [Line Items]                              
Letters of Credit Outstanding, Amount   2,400   $ 2,400     2,400 $ 2,400              
Line of Credit Facility, Maximum Borrowing Capacity   $ 2,900         $ 2,900