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Fair Value (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Assets |  |  |  |  |
Available-for-sale investment securities | $ 1,318,000,000 |  | $ 1,318,000,000 |  | $ 1,137,000,000
OCI, debt securities, available-for-sale, gain (loss), after adjustment, before Tax | 0 | $ 0 | 0 | $ 0 |
Fair Value, Recurring |  |  |  |  |
Assets |  |  |  |  |
Cash equivalents | 1,840,000,000 |  | 1,840,000,000 |  | 1,460,000,000
Available-for-sale investment securities | 1,318,000,000 |  | 1,318,000,000 |  | 1,137,000,000
Fair Value, Recurring | Level 1 |  |  |  |  |
Assets |  |  |  |  |
Cash equivalents | 1,740,000,000 |  | 1,740,000,000 |  | 1,330,000,000
Available-for-sale investment securities | 0 |  | 0 |  | 0
Fair Value, Recurring | Level 2 |  |  |  |  |
Assets |  |  |  |  |
Cash equivalents | 100,000,000 |  | 100,000,000 |  | 130,000,000
Available-for-sale investment securities | 1,318,000,000 |  | 1,318,000,000 |  | 1,137,000,000
Fair Value, Recurring | Level 3 |  |  |  |  |
Assets |  |  |  |  |
Cash equivalents | 0 |  | 0 |  | 0
Available-for-sale investment securities | $ 0 |  | $ 0 |  | $ 0

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- Definition Amount 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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 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 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124260329&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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- Definition 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. + References No definition available. + Details
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- Definition Amount, before tax and after adjustment, of unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e637-108580 + Details
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