Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Millions, $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Statement Of Financial Position [Abstract]
Accounts and accrued income receivable, allowances	$ 14	$ 14
Pledged securities included in debt securities	89	91
Debt securities, amortized cost	$ 9,388	$ 9,317
Preferred stock, par value	$ 0.00001	$ 0.00001
Preferred stock, shares authorized	0.5	0.5
Preferred stock, outstanding	0.0	0.0
Common stock, par value	$ 0.00001	$ 0.00001
Common stock, shares authorized	300.0	300.0
Common stock, shares outstanding	108.7	109.7