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Derivative and Financial Instruments - Cost Basis to Fair Value (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020 | Dec. 31, 2019
Schedule Of Available For Sale Securities [Line Items] |  |  |
Amortized Cost Basis | $ 480 | $ 480 | $ 241
Fair Value | 482 | 482 | 241
Proceeds from sales and redemptions of investments in debt securities classified as available for sale | 109 | 298 |
Corporate Bonds [Member] |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |
Amortized Cost Basis | 283 | 283 | 159
Fair Value | 285 | 285 | 159
Commercial Paper [Member] |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |
Amortized Cost Basis | 111 | 111 | 38
Fair Value | 111 | 111 | 38
Government obligations [Member] |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |
Amortized Cost Basis | 21 | 21 | 25
Fair Value | 21 | 21 | 25
U.S. Government Agency Obligations [Member] |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |
Amortized Cost Basis | 17 | 17 | 0
Fair Value | 17 | 17 | 0
Foreign government obligations [Member] |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |
Amortized Cost Basis | 2 | 2 | 0
Fair Value | 2 | 2 | 0
Asset-backed Securities [Member] |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |
Amortized Cost Basis | 46 | 46 | 19
Fair Value | $ 46 | $ 46 | $ 19

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References 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=121645371&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=121558606&loc=SL82898722-210454 + Details
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- Definition Amount of cash inflow from sale, maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3151-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26853-111562 + Details
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