Restrictions on Dividends and Capital Actions (Details) - USD ($) $ / shares in Units, $ in Billions	3 Months Ended	12 Months Ended
Sep. 30, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash and Cash Equivalents [Abstract]
Dividends from consolidated nonbank subsidiaries		$ 1.8	$ 1.8
Common stock dividends, per share (in dollars per share)	$ 0.37	$ 1.44	$ 1.36	$ 1.26

Aggregate dividends declared during the period for each share of common stock outstanding.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1

Name:	us-gaap_CommonStockDividendsPerShareDeclared
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration