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v3.21.1

Revenues and Segment Information, Contract Balances (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Receivables from contracts with customers, included in receivables, net |  |
Increase |  | $ (3,400)
Contract liabilities, included in accrued expenses |  |
Beginning balance | $ 55 |
Increase | 49 |
Ending balance | 104 |
Contract Balances (Textual) |  |
Revenue recognized that was included in contract liabilities as of prior year end | 37 | $ 52
Receivables from Contracts with Customers [Member] |  |
Receivables from contracts with customers, included in receivables, net |  |
Beginning balance | 3,642 |
Increase | 1,059 |
Ending balance | $ 4,701 |

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- Definition Amount of obligation to transfer good or 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 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130532-203044 + Details
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