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Derivatives (Cash Flow Hedges) (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Aug. 04, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]            
Credit Derivative, Maximum Exposure, Undiscounted   $ 11,507,000,000   $ 11,507,000,000   $ 11,375,000,000
Gain (Loss) on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net   1,000,000 $ (4,000,000) $ 6,000,000 $ 16,000,000  
Maximum Length of Time Hedged in Cash Flow Hedge       4 years   5 years
Accumulated Other Comprehensive Income Loss   1,300,000,000   $ 1,300,000,000   $ 1,500,000,000
Cash Flow Hedges [Member]            
Derivatives in cash flow hedging relationships            
Amount of Gains (Losses) Deferred in AOCI (Effective Portion)   (295,000,000) (125,000,000) (506,000,000) 130,000,000  
Cash Flow Hedges [Member] | Interest rate swaps            
Derivatives in cash flow hedging relationships            
Amount of Gains (Losses) Deferred in AOCI (Effective Portion)   (90,000,000) 14,000,000 (311,000,000) 91,000,000  
Cash Flow Hedges [Member] | Foreign currency swaps            
Derivatives in cash flow hedging relationships            
Amount of Gains (Losses) Deferred in AOCI (Effective Portion)   (118,000,000) (140,000,000) 5,000,000 (99,000,000)  
Cash Flow Hedges [Member] | Credit forwards [Member]            
Derivatives in cash flow hedging relationships            
Amount of Gains (Losses) Deferred in AOCI (Effective Portion)   0 0 0 0  
Cash Flow Hedges [Member] | Interest rate forwards            
Derivatives in cash flow hedging relationships            
Amount of Gains (Losses) Deferred in AOCI (Effective Portion)   (87,000,000) 1,000,000 (200,000,000) 138,000,000  
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)   (8,000,000) 302,000,000 (324,000,000) 934,000,000  
Amount and Location of Gains (Losses) Recognized In Income (Loss) on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)   2,000,000 (5,000,000) 10,000,000 2,000,000  
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)   1,000,000 9,000,000 18,000,000 23,000,000  
Amount and Location of Gains (Losses) Recognized In Income (Loss) on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)   3,000,000 (2,000,000) 5,000,000 5,000,000  
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)   (6,000,000) 294,000,000 (342,000,000) 915,000,000  
Amount and Location of Gains (Losses) Recognized In Income (Loss) on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)   (2,000,000) (3,000,000) 5,000,000 (2,000,000)  
Cash Flow Hedges [Member] | Net derivative gains (losses) | Credit forwards [Member]            
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 1,000,000  
Amount and Location of Gains (Losses) Recognized In Income (Loss) on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)   0 0 0 0  
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)   (3,000,000) (1,000,000) 0 (5,000,000)  
Amount and Location of Gains (Losses) Recognized In Income (Loss) on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)   1,000,000 0 0 (1,000,000)  
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)   4,000,000 5,000,000 13,000,000 13,000,000  
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)   4,000,000 5,000,000 13,000,000 12,000,000  
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)   (1,000,000) 0 (2,000,000) (1,000,000)  
Cash Flow Hedges [Member] | Net Investment Income | Credit forwards [Member]            
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 0  
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)   1,000,000 0 2,000,000 2,000,000  
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)   0 0 2,000,000 2,000,000  
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 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)   0 0 1,000,000 1,000,000  
Cash Flow Hedges [Member] | Other expenses | Credit forwards [Member]            
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 0  
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)   $ 0 0 $ 1,000,000 1,000,000  
Discontinued Operations | Brighthouse Financial, Inc | Cash Flow Hedges [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Reduction of Deferred Gains within AOCI $ 414,000,000   (40,000,000)   (92,000,000)  
Derivatives in cash flow hedging relationships            
Amount and Location of Gains (Losses) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Loss) (Effective Portion)     $ 1,000,000   $ 16,000,000