Consolidated Statements of Cash Flows (Parenthetical) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Cash Flows [Abstract]
Sales of premises and equipment	$ 0	$ 33,000,000
Cash and cash equivalents per Consolidated Balance Sheets	36,095,000,000	33,177,000,000
Restricted cash included in Other assets per Consolidated Balance Sheets	2,513,000,000	454,000,000
Total cash, cash equivalents and restricted cash	$ 38,608,000,000	$ 33,631,000,000