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Fair Value, Reconciliations of Assets and Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Fixed Maturities Available-for-Sale [Member]    
Reconciliations for All Assets and Liabilities [Roll Forward]    
Beginning balance $ 633 $ 419
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in net income 0 0
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in OCI (46) 11
Purchases 112 76
Sales 0 0
Settlements (5) (6)
Transfers into Level 3 0 5
Transfers out of Level 3 (1) (68)
Ending balance 693 437
Unrealized gains (losses) recognized in net income (loss) on level 3 assets and liabilities 0 0
Unrealized gains (losses) recognized in other comprehensive income (loss) on level 3 assets and liabilities (44) 10
Corporate Bonds and Other [Member]    
Reconciliations for All Assets and Liabilities [Roll Forward]    
Beginning balance 468 222
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in OCI (37) 8
Purchases 67 56
Settlements (2) (2)
Transfers out of Level 3   (31)
Ending balance 496 253
Unrealized gains (losses) recognized in other comprehensive income (loss) on level 3 assets and liabilities (35) 7
Asset-Backed [Member]    
Reconciliations for All Assets and Liabilities [Roll Forward]    
Beginning balance 165 197
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in OCI (9) 3
Purchases 45 20
Settlements (3) (4)
Transfers into Level 3   5
Transfers out of Level 3 (1) (37)
Ending balance 197 184
Unrealized gains (losses) recognized in other comprehensive income (loss) on level 3 assets and liabilities (9) 3
Fixed Maturities Trading [Member]    
Reconciliations for All Assets and Liabilities [Roll Forward]    
Beginning balance 4 6
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in net income (1) (1)
Ending balance 3 5
Unrealized gains (losses) recognized in net income (loss) on level 3 assets and liabilities (1) (1)
Total Fixed Maturities [Member]    
Reconciliations for All Assets and Liabilities [Roll Forward]    
Beginning balance 637 425
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in net income (1) (1)
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in OCI (46) 11
Purchases 112 76
Sales 0 0
Settlements (5) (6)
Transfers into Level 3 0 5
Transfers out of Level 3 (1) (68)
Ending balance 696 442
Unrealized gains (losses) recognized in net income (loss) on level 3 assets and liabilities (1) (1)
Unrealized gains (losses) recognized in other comprehensive income (loss) on level 3 assets and liabilities (44) 10
Equity Securities [Member]    
Reconciliations for All Assets and Liabilities [Roll Forward]    
Beginning balance 19 19
Net realized investment gains (losses) and net change in unrealized investment gains (losses), included in net income (3) 2
Ending balance 16 21
Unrealized gains (losses) recognized in net income (loss) on level 3 assets and liabilities $ (3) $ 2