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Fair Value - Fair Value Hierarchy (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Assets
Available-for-sale investment securities	$ 826	$ 1,137
Recurring
Assets
Cash equivalents	1,515	1,460
Available-for-sale investment securities	826	1,137
Recurring | Level 1
Assets
Cash equivalents	1,515	1,330
Available-for-sale investment securities	26	0
Recurring | Level 2
Assets
Cash equivalents	0	130
Available-for-sale investment securities	800	1,137
Recurring | Level 3
Assets
Cash equivalents	0	0
Available-for-sale investment securities	$ 0	$ 0

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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-Publisher FASB
-Name Accounting Standards Codification
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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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