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Long-term Debt - Junior Subordinated Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Sep. 10, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]      
Cancellation of trust preferred securities   $ 475  
Cancellation of trust common securities   $ 15  
Debt Instrument [Line Items]      
Carrying value $ 282,031   $ 284,080
Junior subordinated debt      
Debt Instrument [Line Items]      
Carrying value 2,125   2,275
Junior subordinated debt | Fixed rate      
Debt Instrument [Line Items]      
Carrying value $ 659   $ 690