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Derivatives - Narrative (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Derivative [Line Items]            
Shareholders’ equity $ 268,387 $ 271,408 $ 265,325 $ 262,158 $ 264,216 $ 267,146
Net income (loss) in AOCI expected to be reclassified, after tax (78)          
Net income (loss) in AOCI expected to be reclassified $ (103)          
Terminated cash flow hedges, forecasted transaction hedging period 3 years          
Terminated cash flow hedges, maximum forecasted transaction hedging period 16 years          
Interest rate risk on AFS securities            
Derivative [Line Items]            
Available-for-sale securities from discontinued hedging relationships cumulative increase (decrease) $ 5   (29)      
Credit derivatives            
Derivative [Line Items]            
Cash and securities held as collateral 91,000   81,600      
Cash and securities collateral posted 73,600   56,500      
Collateral not yet posted 2,000          
Credit derivatives | Bank of America, N.A.            
Derivative [Line Items]            
Collateral not yet posted 1,000          
Foreign Mortgage-backed Securities and Foreign Securities            
Derivative [Line Items]            
Transfer of mortgage-backed securities to third-party trust 5,400   5,800      
Gross cash proceeds from transfer of securities 5,400   5,800      
Fair value of derecognized assets 5,300   $ 5,500      
Derivatives            
Derivative [Line Items]            
Shareholders’ equity (365)          
Pretax income (loss) in accumulated OCI $ (479)