Consolidated Statements of Cash Flows (Parenthetical) - USD ($)	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Statement of Cash Flows [Abstract]
Sales of premises and equipment	$ 0	$ 34,000,000
Cash and cash equivalents per Consolidated Balance Sheets	41,497,000,000	26,869,000,000
Restricted cash included in Other assets per Consolidated Balance Sheets	606,000,000	463,000,000
Total cash, cash equivalents and restricted cash	$ 42,103,000,000	$ 27,332,000,000