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Fair Value (Reconciliation Of The Beginning And Ending Balances Of Assets Measured At Fair Value On A Recurring Basis Using Level III Inputs) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 397 $ 623
Total gains (losses) recognized in net income (8) (3)
Total gains (losses) recognized in accumulated other comprehensive loss (10) 2
Purchases 38 42
Sales (12) (22)
Settlements (13) (22)
Transfers into Level III 13 3
Transfers out of Level III   (9)
Ending balance 405 614
Change in unrealized gains (losses) included in net income related to assets still held (7) (2)
Corporate Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 303 287
Total gains (losses) recognized in net income (2) (1)
Total gains (losses) recognized in accumulated other comprehensive loss (10) 2
Purchases 26 33
Sales (3) (1)
Settlements (11) (21)
Transfers into Level III 13 0
Transfers out of Level III   (2)
Ending balance 316 297
Change in unrealized gains (losses) included in net income related to assets still held 0 0
Residential Mortgage-Backed Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 2 6
Total gains (losses) recognized in net income 0 0
Total gains (losses) recognized in accumulated other comprehensive loss 0 0
Purchases 0 0
Sales 0 0
Settlements 0 0
Transfers into Level III 0 0
Transfers out of Level III   0
Ending balance 2 6
Change in unrealized gains (losses) included in net income related to assets still held 0 0
Other Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 7 17
Total gains (losses) recognized in net income 0 0
Total gains (losses) recognized in accumulated other comprehensive loss 0 0
Purchases 0 2
Sales 0 0
Settlements (2) (1)
Transfers into Level III 0 3
Transfers out of Level III   (7)
Ending balance 5 14
Change in unrealized gains (losses) included in net income related to assets still held 0 0
Equity Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 85 313
Total gains (losses) recognized in net income (6) (2)
Total gains (losses) recognized in accumulated other comprehensive loss 0 0
Purchases 12 7
Sales (9) (21)
Settlements 0 0
Transfers into Level III 0 0
Transfers out of Level III   0
Ending balance 82 297
Change in unrealized gains (losses) included in net income related to assets still held $ (7) $ (2)