Regulatory Matters (Summary of Actual Capital Amounts and Ratios for the Company and Its Three Largest Subsidiary Banks) (Details) $ in Millions	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]
Total capital (to risk-weighted assets), Actual Amount	$ 8,077	$ 7,652
Total capital (to risk-weighted assets), Capital Ratio	0.122	0.128
Total capital (to risk-weighted assets), To be well capitalized, Amount	$ 6,611	$ 5,960
Total capital (to risk-weighted assets), To be well capitalized, Ratio	0.100	0.100
Tier 1 capital (to risk-weighted assets), Actual Amount	$ 6,921	$ 6,508
Tier 1 capital (to risk-weighted assets), Capital Ratio	0.105	0.109
Tier 1 capital (to risk-weighted assets), To be well capitalized, Amount	$ 5,289	$ 4,768
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	$ 6,481	$ 6,068
Common equity tier 1 capital (to risk-weighted assets), Capital Ratio	0.098	0.102
Common equity tier 1 capital (to risk-weighted assets), To be well capitalized, Amount	$ 4,297	$ 3,874
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	$ 6,921	$ 6,508
Tier 1 capital (to average assets), Actual Ratio	0.077	0.072
Tier 1 capital (to average assets), To be well capitalized, Amount	$ 4,472	$ 4,546
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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI https://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826

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