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Fair Value Measurements - Assets and Liabilities Measured at Fair Value On a Recurring Basis (Details) - Fair Value, Recurring - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Level 2 |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Cash flow hedges | $ 9 | $ 4
Level 3 |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |
Contingent consideration | 46 | 0
Contingent consideration | 0 | 1
Contingent debt guarantee | $ 8 | $ 0

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- Definition Fair value of all asset derivatives designated as cash flow hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624163-113959 + Details
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- Definition Fair value portion of guarantee, including, but not limited to, financial standby letter of credit, fair value guarantee, guarantee of collection of scheduled contractual cash flows from financial assets, and contracts that contingently require the guarantor to make payments or perform services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121555522&loc=d3e12201-110248 + Details
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