Derivative and Financial Instruments (Financial Instruments - Amortized Cost Basis and Fair Value of Investments in Debt Securities Classified as Available for Sale) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost Basis	$ 479	$ 516
Fair Value	479	518
Corporate Bonds [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost Basis	305	271
Fair Value	304	273
Commercial Paper [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost Basis	88	168
Fair Value	89	168
U.S. Government Obligations [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost Basis	2	17
Fair Value	2	17
U.S. Government Agency Obligations [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost Basis	10	17
Fair Value	10	17
Foreign Government Obligations [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost Basis	9	2
Fair Value	9	2
Asset-backed Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost Basis	65	41
Fair Value	$ 65	$ 41

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

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- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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