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Investment Securities - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
security
Sep. 30, 2017
USD ($)
Jan. 01, 2018
USD ($)
Dec. 31, 2017
USD ($)
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]            
Pledged securities not separately reported $ 34,000   $ 34,000     $ 48,000
Pre-tax gain on sale of securities 0 $ 1 8 $ (39)    
Net impairment losses $ 1 $ 1 2 $ 1    
Gross pre-tax unrealized losses     $ 1,755      
Number of securities in loss position | security     1,255      
US Treasury and federal agencies, mortgage-backed securities            
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]            
Securities sold     $ 16,000      
Pre-tax gain on sale of securities     $ 8      
Minimum            
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]            
Available-for-sale securities transferred to held to maturity     10 years      
Maximum            
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]            
Available-for-sale securities transferred to held to maturity     42 years      
Accounting Standards Update 2016-01            
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]            
Money market funds reclassified         $ 397  
Available-for-sale equity securities reclassified         $ 46