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Share-Based Compensation - Narrative (Details) - USD ($) shares in Thousands, $ in Millions | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based compensation expense | $ 66 | $ 108
Unrecognized compensation cost | $ 410 |
Weighted-average period unrecognized compensation cost will be recognized (in years) | 2 years 4 months 24 days |
Share-based awards, stock options, exercised (in shares) | 1,598 |
Stock options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based awards, stock options, exercised (in shares) | 1,600 | 900

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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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