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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Statement of Financial Position [Abstract]    
Securities available for sale, amortized cost $ 97,569 $ 77,984
Securities available for sale, allowance for credit loss 1  
Loans held for sale $ 596 $ 251
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized 50,000,000 50,000,000
Preferred stock, shares issued 4,975,000 4,975,000
Preferred stock, shares outstanding 4,975,000 4,975,000
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized 1,000,000,000 1,000,000,000
Common stock, shares issued 679,932,837 672,969,391
Common stock, shares outstanding 458,972,202 456,562,399
Treasury stock, par value (in dollars per share) $ 0.01 $ 0.01
Treasury stock, shares 220,960,635 216,406,992