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Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Millions, $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Statement Of Financial Position [Abstract]
Accounts and accrued income receivable, allowances	$ 14	$ 14
Pledged securities included in debt securities	91	94
Debt securities, amortized cost	$ 9,317	$ 6,121
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	109.7	110.4

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Amount of allowance for credit loss on accounts receivable.

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