Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Thousands, $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Investment securities:
Held-to-maturity, Estimated fair value	$ 10,105	$ 10,466
Shareholders’ equity:
Preferred stock, shares authorized (in shares)	4,400	4,400
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	350,000	350,000
Common stock, shares issued (in shares)	147,653	148,153
Common stock, outstanding shares (in shares)	147,653	148,153