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Investments (Schedule Of Increase (Decrease) In Payables For Collateral On Investments) (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Increase (decrease) in payables for collateral on investments    
Collateral payable for derivative investments $ 1,415 $ 1,390
Securities pledged under securities lending agreements 112 9
Investments pledged for FHLBI 450 550
Total increase (decrease) in payables for collateral on investments $ 1,977 $ 1,949