Regulatory Matters (Summary of Actual Capital Amounts and Ratios for the Company and Its Three Largest Subsidiary Banks) (Details) $ in Millions	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]
Total capital (to risk-weighted assets), Actual Amount	$ 8,553	$ 8,077
Total capital (to risk-weighted assets), Capital Ratio	0.128	0.122
Total capital (to risk-weighted assets), To be well capitalized, Amount	$ 6,693	$ 6,611
Total capital (to risk-weighted assets), To be well capitalized, Ratio	0.100	0.100
Tier 1 capital (to risk-weighted assets), Actual Amount	$ 7,303	$ 6,921
Tier 1 capital (to risk-weighted assets), Capital Ratio	0.109	0.105
Tier 1 capital (to risk-weighted assets), To be well capitalized, Amount	$ 5,355	$ 5,289
Tier 1 capital (to risk-weighted assets), To be well capitalized, Ratio	0.080	0.080
Common equity tier 1 capital (to risk-weighted assets), Actual Amount	$ 6,863	$ 6,481
Common equity tier 1 capital (to risk-weighted assets), Capital Ratio	0.103	0.098
Common equity tier 1 capital (to risk-weighted assets), To be well capitalized, Amount	$ 4,351	$ 4,297
Common equity tier 1 capital (to risk-weighted assets), To be well capitalized, Ratio	0.065	0.065
Tier 1 capital (to average assets), Actual Amount	$ 7,303	$ 6,921
Tier 1 capital (to average assets), Actual Ratio	0.083	0.077
Tier 1 capital (to average assets), To be well capitalized, Amount	$ 4,379	$ 4,472
Tier 1 capital (to average assets), To be well capitalized, Ratio	0.050	0.050

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Ratio of minimum Common Equity Tier 1 risk-based capital to risk-weighted assets categorized as well capitalized as defined by regulatory framework for prompt corrective action.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480696/942-505-50-1

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