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Share-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2020 | Jul. 29, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation expense |  |  | $ 229 | $ 73 | $ 63
Unrecognized compensation cost |  |  | $ 496 |  |
Weighted-average period unrecognized compensation cost will be recognized |  |  | 1 year 8 months 12 days |  |
Share-based awards, stock options, exercised (in shares) |  |  | 4,659,000 |  |
Weighted-average estimated fair value per share of stock options granted (in dollars per share) |  |  | $ 28.52 | $ 22.48 | $ 18.76
Share-based awards available for grant (in shares) |  |  | 33,200,000 |  |
Stock options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  |  | 3 years |  |
Period that awards will expire |  |  | 10 years |  |
Share-based awards, stock options, exercised (in shares) |  |  | 4,700,000 | 2,700,000 | 2,900,000
Employee stock purchase plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Employee purchase percentage of the closing price of common stock |  |  | 85.00% |  |
Compensation expense recognized related to discount on purchase date (as a percent) |  |  | 15.00% |  |
Share-based awards available for grant (in shares) |  |  | 24,700,000 |  |
Shares issued under equity plan (in shares) |  |  | 600,000 | 700,000 | 800,000
First Data |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Entity shares issued per acquiree share (in shares) |  | 0.303 |  |  |
Stock price achievement of common stock (in dollars per share) |  | $ 32 |  |  |
Equity Awards | First Data |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation cost |  | $ 467 |  |  |
Weighted-average period unrecognized compensation cost will be recognized |  | 1 year 2 months 12 days |  |  |
Consideration transferred, equity value |  | $ 768 |  |  |
Subsequent Event | Employee stock purchase plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Compensation expense recognized related to discount on purchase date (as a percent) | 10.00% |  |  |  |

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- Definition Business Combination, Equity Awards Granted At Initial Public Offering Subject To Vesting Upon Stock Price Achievement, Share Price + References No definition available. + 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=116856206&loc=d3e5070-113901 + Details
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- Definition Discount rate from fair value on purchase date that participants pay for shares. + 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 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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