Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Investment securities:
Held-to-maturity, Estimated fair value	$ 414	$ 443
Shareholders’ equity:
Preferred stock, shares authorized (in shares)	4,400,000	4,400,000
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	350,000,000	350,000,000
Common stock, shares issued (in shares)	151,348,000	151,625,000
Common stock, outstanding shares (in shares)	151,348,000	151,625,000