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Revenue Recognition Accounting Policy (Details 3) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
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Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Deferred Revenue | $ 407 | $ 415
1 year [Member] |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Deferred Revenue, Revenue Recognized | 64 |
2 years [Member] |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Deferred Revenue, Revenue Recognized | 59 |
3 years [Member] |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Deferred Revenue, Revenue Recognized | 54 |
4 years [Member] |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Deferred Revenue, Revenue Recognized | 49 |
5 years [Member] |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Deferred Revenue, Revenue Recognized | 43 |
Thereafter 5 years [Member] |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Deferred Revenue, Revenue Recognized | $ 138 |

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- Definition Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(5)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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