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Fair Value Measurements (Changes In Level 3 Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Interest Rate Contracts        
Balance at beginning of period $ 11   $ 0  
Realized gains (losses) recorded in earnings 0   0  
Unrealized gains (losses) recorded in earnings [1] (9)   2  
Gains (losses) recorded in other comprehensive income 0   0  
Sales 0   0  
Balance at end of period 2   2  
Warrants        
Balance at beginning of period 3 $ 3 4 $ 3
Realized gains (losses) recorded in earnings [1] 1 4 1 4
Unrealized gains (losses) recorded in earnings 0 0 (1) [1] 1 [1]
Gains (losses) recorded in other comprehensive income 0 0 0 0
Sales (1) (3) (1) (4)
Balance at end of period 3 4 3 4
Other Derivative Liabilities        
Balance at beginnning of period 1 2 1 2
Realized gains (losses) recorded in earnings 0 0 0 0
Unrealized gains (losses) recorded in earnings 0 0 0 0
Gains (losses) recorded in other comprehensive income 0 0 0 0
Sales 0 0 0 0
Balance at end of period 1 2 1 2
Investment Securities Available-For-Sale        
Balance at beginning of period 95 142 136 159
Realized gains (losses) recorded in earnings 0 0 (2) [2] 1 [2]
Unrealized gains (losses) recorded in earnings 0 0 0 0
Gains (losses) recorded in other comprehensive income 0 1 [3] 1 [3] 7 [3]
Sales 0 (1) (40) (25)
Balance at end of period 95 142 95 142
State And Municipal Securities | Investment Securities Available-For-Sale        
Balance at beginning of period [4] 23 23 23 22
Realized gains (losses) recorded in earnings [4] 0 0 0 0
Unrealized gains (losses) recorded in earnings [4] 0 0 0 0
Gains (losses) recorded in other comprehensive income [4] 0 0 0 1 [3]
Sales [4] 0 0 0 0
Balance at end of period [4] 23 23 23 23
Corporate Debt Securities | Investment Securities Available-For-Sale        
Balance at beginning of period [4] 1 1 1 1
Realized gains (losses) recorded in earnings [4] 0 0 0 0
Unrealized gains (losses) recorded in earnings [4] 0 0 0 0
Gains (losses) recorded in other comprehensive income [4] 0 0 0 0
Sales [4] 0 0 0 0
Balance at end of period [4] 1 1 1 1
Equity and Other Non-Debt Securities | Investment Securities Available-For-Sale        
Balance at beginning of period [4] 71 118 112 136
Realized gains (losses) recorded in earnings [4] 0 0 (2) [2] 1 [2]
Unrealized gains (losses) recorded in earnings [4] 0 0 0 0
Gains (losses) recorded in other comprehensive income [4] 0 1 [3] 1 [3] 6 [3]
Sales [4] 0 (1) (40) (25)
Balance at end of period [4] $ 71 $ 118 $ 71 $ 118
[1] Realized and unrealized gains and losses due to changes in fair value recorded in "other noninterest income" on the consolidated statements of comprehensive income.
[2] Realized and unrealized gains and losses due to changes in fair value recorded in "net securities gains" on the consolidated statements of comprehensive income.
[3] Recorded in "net unrealized gains (losses) on investment securities available-for-sale" in other comprehensive income.
[4] Auction-rate securities.