Other Assets Other Assets, Summary of Net Gains/(Losses) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Equity Securities, FV-NI, Gain (Loss)	[1]	$ 0	$ 13	$ 4	$ 14
Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Annual Amount		0	0	0	0
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount	[1]	0	12	0	23
Equity Securities, FV-NI, Realized Gain (Loss)		0	0	0	0
Equity Securities [Member]
Unrealized Gain (Loss) on Securities		$ 0	$ 13	$ 4	$ 37

[1] Recognized in Other noninterest income in the Company’s Consolidated Statements of Income.