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Summary of Significant Accounting Policies - Recently Issued Accounting Standards (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 USD ($) item | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Research and Development |  |  |  |
Research and development expense | $ 191 | $ 134 | $ 143 |
Recently issued accounting standards |  |  |  |
ROU assets | 496 | 390 |  |
Lease liabilities | 531 |  |  |
Total equity | 4,434 | 3,828 | 3,601 | $ 3,372
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
Recently issued accounting standards |  |  |  |
Total equity |  |  | (3) |
Cumulative Effect, Period of Adoption, Adjustment | Allowance for Credit Losses |  |  |  |
Recently issued accounting standards |  |  |  |
Total equity |  |  | 3 |
Retained Earnings |  |  |  |
Recently issued accounting standards |  |  |  |
Total equity | $ 4,847 | $ 4,287 | 4,030 | $ 3,770
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
Recently issued accounting standards |  |  |  |
Total equity |  |  | $ (3) |
Designated as hedge |  |  |  |
Derivative commodity instruments |  |  |  |
Number of derivative agreements | item | 0 |  |  |

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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 912 -SubTopic 730 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6472174&loc=d3e58812-109433 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 + Details
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