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Derivatives (Cash Flow Hedges) (Details) - USD ($)
$ in Millions
12 Months Ended
Aug. 04, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]        
Maximum Length of Time Hedged in Cash Flow Hedge   4 years 5 years  
Derivative, Average Remaining Maturity   4 years 3 months 4 years 4 months  
Cash Flow Hedges [Member]        
Derivatives in cash flow hedging relationships        
Amount of Gains (Losses) Deferred in AOCI   $ 157 $ (47) $ 273
Cash Flow Hedges [Member] | Interest rate swaps        
Derivatives in cash flow hedging relationships        
Amount of Gains (Losses) Deferred in AOCI   (143) 78 50
Cash Flow Hedges [Member] | Foreign currency swaps        
Derivatives in cash flow hedging relationships        
Amount of Gains (Losses) Deferred in AOCI   414 (335) 589
Cash Flow Hedges [Member] | Interest rate forwards        
Derivatives in cash flow hedging relationships        
Amount of Gains (Losses) Deferred in AOCI   (114) 210 (366)
Cash Flow Hedges [Member] | Credit forwards        
Derivatives in cash flow hedging relationships        
Amount of Gains (Losses) Deferred in AOCI   0 0 0
Cash Flow Hedges [Member] | Net derivative gains (losses)        
Derivatives in cash flow hedging relationships        
Amount and Location of Gains (Losses) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Loss) (Effective Portion)   (536) 988 (292)
Amount and Location of Gains (Losses) Recognized In Income (Loss) on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)   11 12 0
Cash Flow Hedges [Member] | Net derivative gains (losses) | Interest rate swaps        
Derivatives in cash flow hedging relationships        
Amount and Location of Gains (Losses) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Loss) (Effective Portion)   23 24 56
Amount and Location of Gains (Losses) Recognized In Income (Loss) on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)   3 18 (1)
Cash Flow Hedges [Member] | Net derivative gains (losses) | Foreign currency swaps        
Derivatives in cash flow hedging relationships        
Amount and Location of Gains (Losses) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Loss) (Effective Portion)   (558) 974 (350)
Amount and Location of Gains (Losses) Recognized In Income (Loss) on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)   8 (4) 1
Cash Flow Hedges [Member] | Net derivative gains (losses) | Interest rate forwards        
Derivatives in cash flow hedging relationships        
Amount and Location of Gains (Losses) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Loss) (Effective Portion)   (2) (11) (1)
Amount and Location of Gains (Losses) Recognized In Income (Loss) on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)   0 (2) 0
Cash Flow Hedges [Member] | Net derivative gains (losses) | Credit forwards        
Derivatives in cash flow hedging relationships        
Amount and Location of Gains (Losses) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Loss) (Effective Portion)   1 1 3
Amount and Location of Gains (Losses) Recognized In Income (Loss) on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)   0 0 0
Cash Flow Hedges [Member] | Net Investment Income        
Derivatives in cash flow hedging relationships        
Amount and Location of Gains (Losses) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Loss) (Effective Portion)   16 18 15
Cash Flow Hedges [Member] | Net Investment Income | Interest rate swaps        
Derivatives in cash flow hedging relationships        
Amount and Location of Gains (Losses) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Loss) (Effective Portion)   18 16 12
Cash Flow Hedges [Member] | Net Investment Income | Foreign currency swaps        
Derivatives in cash flow hedging relationships        
Amount and Location of Gains (Losses) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Loss) (Effective Portion)   (5) 0 (2)
Cash Flow Hedges [Member] | Net Investment Income | Interest rate forwards        
Derivatives in cash flow hedging relationships        
Amount and Location of Gains (Losses) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Loss) (Effective Portion)   2 2 4
Cash Flow Hedges [Member] | Net Investment Income | Credit forwards        
Derivatives in cash flow hedging relationships        
Amount and Location of Gains (Losses) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Loss) (Effective Portion)   1 0 1
Cash Flow Hedges [Member] | Other expenses        
Derivatives in cash flow hedging relationships        
Amount and Location of Gains (Losses) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Loss) (Effective Portion)   3 3 3
Cash Flow Hedges [Member] | Other expenses | Interest rate swaps        
Derivatives in cash flow hedging relationships        
Amount and Location of Gains (Losses) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Loss) (Effective Portion)   0 0 0
Cash Flow Hedges [Member] | Other expenses | Foreign currency swaps        
Derivatives in cash flow hedging relationships        
Amount and Location of Gains (Losses) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Loss) (Effective Portion)   2 2 2
Cash Flow Hedges [Member] | Other expenses | Interest rate forwards        
Derivatives in cash flow hedging relationships        
Amount and Location of Gains (Losses) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Loss) (Effective Portion)   1 1 1
Cash Flow Hedges [Member] | Other expenses | Credit forwards        
Derivatives in cash flow hedging relationships        
Amount and Location of Gains (Losses) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Loss) (Effective Portion)   $ 0 0 0
Brighthouse Financial, Inc | Discontinued Operations [Member] | Cash Flow Hedges [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Reduction of Deferred Gains within AOCI $ 414   (92) 71
Derivatives in cash flow hedging relationships        
Amount and Location of Gains (Losses) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Loss) (Effective Portion)     $ 16 $ 45
B [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative, Average Remaining Maturity   4 years 12 months 4 years 11 months  
B [Member] | Single name credit default swaps (3)        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative, Average Remaining Maturity   0 years 3 years 6 months