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Employee Benefits - ESPP Activity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuances under employee stock purchase plan	$ 103	$ 111	$ 100
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued	2	2	2
Issuances under employee stock purchase plan	$ 103	$ 111	$ 100
Weighted-average grant date fair value of ESPP shares granted (in dollars per share)	$ 13.40	$ 14.58	$ 15.09
Total fair value of ESPP shares as of the respective vesting dates	$ 21	$ 23	$ 24

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