v3.10.0.1
Parent Company (Condensed Balance Sheets) (Details) - USD ($)
$ / shares in Units, $ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash and cash equivalents:        
Cash and due from banks $ 30,541 $ 24,816 $ 22,017  
Restricted cash 35,356 34,231 33,979  
Trading assets at fair value 266,299 298,282    
Investment securities (includes $15,500 and $13,219 at fair value) 91,832 78,802    
Equity investment in subsidiaries:        
Other assets 15,641 16,628    
Total assets 853,531 851,733    
Liabilities        
Trading liabilities at fair value 126,747 131,295    
Securities sold under agreements to repurchase with affiliates 49,759 56,424    
Other liabilities and accrued expenses 17,204 17,157    
Borrowings (includes $18,599 and $22,603 at fair value) 189,662 192,582    
Total liabilities 772,125 773,267    
Commitments and contingent liabilities    
Equity        
Preferred stock 8,520 8,520    
Common stock, $0.01 par value: Shares authorized: 3,500,000,000; Shares issued: 2,038,893,979; Shares outstanding: 1,699,828,943 and 1,788,086,805 20 20    
Additional paid-in capital 23,794 23,545    
Retained earnings 64,175 57,577    
Employee stock trusts 2,836 2,907    
AOCI (2,292) (3,060) (2,643) $ (1,656)
Common stock held in treasury at cost, $0.01 par value (339,065,036 and 250,807,174 shares) (13,971) (9,211)    
Common stock issued to employee stock trusts (2,836) (2,907)    
Total shareholders' equity 81,406 78,466 $ 77,177 $ 76,184
Total liabilities and equity 853,531 851,733    
Statement of Financial Position Parenthetical Disclosures [Abstract]        
Investment securities at fair value 61,061 55,203    
Borrowings at fair value $ 51,184 $ 46,912    
Common stock par value (per share) $ 0.01 $ 0.01    
Common stock, shares authorized 3,500,000,000 3,500,000,000    
Common stock, shares issued 2,038,893,979 2,038,893,979    
Common stock, shares outstanding 1,699,828,943 1,788,086,805 1,852,000,000  
Common stock held in treasury, shares 339,065,036 250,807,174    
Parent Company        
Cash and cash equivalents:        
Cash and due from banks $ 6 $ 11 $ 116  
Deposits with banking subsidiaries 7,476 8,120 3,600  
Restricted cash 0 1 $ 3  
Trading assets at fair value 10,039 5,752    
Investment securities (includes $15,500 and $13,219 at fair value) 22,588 19,268    
Securities purchased under agreement to resell with affiliates 25,535 38,592    
Advances to subsidiaries:        
Bank and BHC 30,954 30,145    
Non-bank 97,405 112,557    
Equity investment in subsidiaries:        
Bank and BHC 42,848 35,971    
Non-bank 32,418 31,856    
Other assets 1,244 2,704    
Total assets 270,513 284,977    
Liabilities        
Trading liabilities at fair value 276 148    
Securities sold under agreements to repurchase with affiliates 0 8,753    
Payables to subsidiaries 30,861 28,781    
Other liabilities and accrued expenses 2,548 2,421    
Borrowings (includes $18,599 and $22,603 at fair value) 156,582 167,483    
Total liabilities 190,267 207,586    
Commitments and contingent liabilities    
Equity        
Preferred stock 8,520 8,520    
Common stock, $0.01 par value: Shares authorized: 3,500,000,000; Shares issued: 2,038,893,979; Shares outstanding: 1,699,828,943 and 1,788,086,805 20 20    
Additional paid-in capital 23,794 23,545    
Retained earnings 64,175 57,577    
Employee stock trusts 2,836 2,907    
AOCI (2,292) (3,060)    
Common stock held in treasury at cost, $0.01 par value (339,065,036 and 250,807,174 shares) (13,971) (9,211)    
Common stock issued to employee stock trusts (2,836) (2,907)    
Total shareholders' equity 80,246 77,391    
Total liabilities and equity 270,513 284,977    
Statement of Financial Position Parenthetical Disclosures [Abstract]        
Investment securities at fair value 15,500 13,219    
Borrowings at fair value $ 18,599 $ 22,603    
Common stock par value (per share) $ 0.01 $ 0.01    
Common stock, shares authorized 3,500,000,000 3,500,000,000    
Common stock, shares issued 2,038,893,979 2,038,893,979    
Common stock, shares outstanding 1,699,828,943 1,788,086,805    
Common stock held in treasury, shares 339,065,036 250,807,174