Fair Value, Changes in Fair Value of Assets Recorded at Fair Value on Nonrecurring Basis (Details) - Fair Value, Measurements, Nonrecurring [Member] - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018
Fair Value Assets And Liabilities Measured On Nonrecurring Basis Increase (Decrease) [Line Items]
Mortgage loans held for sale (LOCOM)	$ 18	$ 13
Loans held for sale	(2)	(78)
Loans	(227)	(323)
Nonmarketable equity securities	264	(17)
Other assets	(29)	(30)
Total	24	(435)
Total Commercial [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis Increase (Decrease) [Line Items]
Loans	(106)	(138)
Total Consumer [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis Increase (Decrease) [Line Items]
Loans	$ (121)	$ (185)

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