XML 34 R88.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Investments (Related Party Investment Transactions - Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Related Party Transaction [Line Items]            
Carrying value of equity method investments sold     $ 89 $ 2,400    
Proceeds from sale of equity method investments     286      
Gain on sale of equity method investment recognized as capital contribution $ 1,100 $ 750 $ 202      
Related party investment administrative service charges       $ 1,100 $ 1,100 $ 1,000
Affiliated Entity            
Related Party Transaction [Line Items]            
Invested assets transferred, estimated fair value           292
Invested assets transferred, amortized cost           294
Net investment gains (losses) recognized on invested assets transferred           (2)
MetLife Investment Management, LLC            
Related Party Transaction [Line Items]            
Related party investment administrative service charges         $ 49 $ 93