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Investment Securities (Schedule Of Realized Gain (Loss)) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract]    
Available-for-sale securities, gross realized gains $ 105 $ 10
Available-for-sale securities, gross realized losses 0 (1)
Net realized gains on available-for-sale securities 105 9
Net realized gain on equity securities 1 29
Net unrealized (loss) gain on equity securities (185) 70
Other (loss) gain on investments, net $ (79) $ 108