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Fair Value - Changes in Level 3 Financial Assets (Details) - Recurring - Level 3
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Beginning balance $ 131
Net realized and unrealized capital gains (losses):  
Included in earnings (20)
Included in other comprehensive income 23
Purchases 18
Sales (47)
Settlements (13)
Transfers out of Level 3, net (4)
Ending balance 88
Foreign securities  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Beginning balance 3
Net realized and unrealized capital gains (losses):  
Included in earnings 0
Included in other comprehensive income 0
Purchases 2
Sales 0
Settlements (1)
Transfers out of Level 3, net (4)
Ending balance 0
U.S. corporate securities  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Beginning balance 67
Net realized and unrealized capital gains (losses):  
Included in earnings (33)
Included in other comprehensive income 18
Purchases 3
Sales (6)
Settlements (12)
Transfers out of Level 3, net 0
Ending balance 37
Equity securities  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Beginning balance 54
Net realized and unrealized capital gains (losses):  
Included in earnings 13
Included in other comprehensive income 0
Purchases 13
Sales (41)
Settlements 0
Transfers out of Level 3, net 0
Ending balance 39
Redeemable preferred securities  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Beginning balance 7
Net realized and unrealized capital gains (losses):  
Included in earnings 0
Included in other comprehensive income 5
Purchases 0
Sales 0
Settlements 0
Transfers out of Level 3, net 0
Ending balance $ 12