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Discontinued Operations - Impact of the sale of the annuity businesses (Details) - USD ($)
$ in Millions
2 Months Ended 3 Months Ended 5 Months Ended 6 Months Ended
May 31, 2021
May 31, 2021
Jun. 30, 2020
May 31, 2021
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Cash proceeds from sale of businesses         $ 3,547 $ 0  
Net investment in annuity businesses sold, excluding AOCI         $ 5,601   $ 6,789
Annuity subsidiaries              
Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Cash proceeds from sale of businesses $ 3,537            
Receivable from MassMutual 32 $ 32   $ 32      
Sale related expenses (8)            
Total net proceeds 3,561            
Net investment in annuity businesses sold, excluding AOCI 2,865 2,865   2,865     $ 2,893
Reclassify net deferred tax asset 210            
Realized gain on subsidiary 906            
Tax liabilities triggered by pending sale in the first quarter of 2021 41            
Other tax expense on gain on sale of subsidiaries (1)            
Total income tax expense on gain on sale of subsidiaries 250            
Gain on sale, net of tax $ 656 $ 697 $ 0 $ 656   $ 0