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Fair Value of Assets and Liabilities - Change in unrealized gains and losses included in net income for level 3 assets and liabilities (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Gains (losses) included in net income for Level 3 assets and liabilities:    
Fair value assets measured on recurring basis, change in unrealized gain (loss) included in earnings $ 18 $ (29)
Gains (losses) for Level 3 liabilities still held at the balance sheet date, included in earnings 55 48
Gains (losses) for Level 3 assets and liabilities still held at the balance sheet date, included in earnings 73 19
Changes in unrealized net capital gains and losses reported in OCI (4) (2)
Net investment income    
Gains (losses) included in net income for Level 3 assets and liabilities:    
Gains (losses) for Level 3 assets still held at the balance sheet date (1) (14)
Realized capital gains (losses)    
Gains (losses) included in net income for Level 3 assets and liabilities:    
Gains (losses) for Level 3 assets still held at the balance sheet date 18 (3)
Liabilities held for sale    
Gains (losses) included in net income for Level 3 assets and liabilities:    
Gains (losses) for Level 3 liabilities still held at the balance sheet date, included in earnings 55 48
Municipal    
Gains (losses) included in net income for Level 3 assets and liabilities:    
Changes in unrealized net capital gains and losses reported in OCI 0 (1)
Corporate - public    
Gains (losses) included in net income for Level 3 assets and liabilities:    
Fair value assets measured on recurring basis, change in unrealized gain (loss) included in earnings 1 0
Changes in unrealized net capital gains and losses reported in OCI (3) 0
Corporate - privately placed    
Gains (losses) included in net income for Level 3 assets and liabilities:    
Fair value assets measured on recurring basis, change in unrealized gain (loss) included in earnings 0 0
Changes in unrealized net capital gains and losses reported in OCI (1) 0
Fixed income securities    
Gains (losses) included in net income for Level 3 assets and liabilities:    
Fair value assets measured on recurring basis, change in unrealized gain (loss) included in earnings 1 0
Equity securities    
Gains (losses) included in net income for Level 3 assets and liabilities:    
Fair value assets measured on recurring basis, change in unrealized gain (loss) included in earnings 16 (17)
Assets held for sale    
Gains (losses) included in net income for Level 3 assets and liabilities:    
Fair value assets measured on recurring basis, change in unrealized gain (loss) included in earnings 1 (12)
Changes in unrealized net capital gains and losses reported in OCI $ 0 $ (1)