The Total risk based capital ratio (total capital divided by risk weighted assets) required to be categorized as "well capitalized", in the regulatory framework for prompt corrective action.

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Amount of cash equivalents restricted as to withdrawal or usage. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Average daily balance for period of deposits required and made with Federal Reserve Banks pursuant to Federal Reserve Board regulations.

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Cash, Loan and Dividend Restrictions (Details) - USD ($) $ / shares in Units, $ in Millions			12 Months Ended
	Mar. 01, 2019	Jan. 22, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash, Loan and Dividend Restrictions [Line Items]
Average Cash Reserve Deposit Required And Made Federal Reserve Banks			$ 12,428	$ 12,306
Credit And Non-Credit Transactions With All Nonbank Affiliates, Maximum Percent of Bank Capital and Surplus			20.00%
Common Stock, Dividends, Per Share, Declared			$ 1.640	$ 1.540	$ 1.515
Reserve balance for non-US central banks [Member]
Cash, Loan and Dividend Restrictions [Line Items]
Restricted Cash Equivalents			$ 517	$ 617
Segregated for benefit brokerage customers under federal and other brokerage regulations f[Member]
Cash, Loan and Dividend Restrictions [Line Items]
Restricted Cash Equivalents			1,135	666
Related to consolidated variable interest entities (VIEs) that can only be used to settle liabilities of VIEs [Member]
Cash, Loan and Dividend Restrictions [Line Items]
Restricted Cash Equivalents			147	$ 487
Bank Subsidiaries [Member]
Cash, Loan and Dividend Restrictions [Line Items]
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments without Regulatory Approval			15,200
Nonbank Subsidiaries [Member]
Cash, Loan and Dividend Restrictions [Line Items]
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments without Regulatory Approval			$ 24,400
Subsequent Event [Member]
Cash, Loan and Dividend Restrictions [Line Items]
Common Stock, Dividends, Per Share, Declared		$ 0.45
Dividends Payable, Date Declared		Jan. 22, 2019
Dividends Payable, Date To be Paid	Mar. 01, 2019
Credit and non-credit transactions with a single nonbank affiliate, maximum percent of bank capital and surplus [Member]
Cash, Loan and Dividend Restrictions [Line Items]
Capital Required to be Well Capitalized to Risk Weighted Assets			10.00%