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Investment Securities - Narrative (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
security
Jun. 30, 2017
USD ($)
Jan. 01, 2018
USD ($)
Dec. 31, 2017
USD ($)
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]            
Pledged securities not separately reported $ 33,000   $ 33,000     $ 48,000
Net impairment losses $ 1 $ 1 1 $ 1    
Gross pre-tax unrealized losses     $ 1,404      
Number of securities in loss position | security     1,118      
US Treasury and federal agencies, mortgage-backed securities            
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]            
Securities sold     $ 16,000      
Loss 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