Repurchases of Common Stock - Narrative (Details) - USD ($) |
3 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|
Mar. 31, 2018 |
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 06, 2017 |
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| Equity, Class of Treasury Stock [Line Items] | ||||
| Aggregate market value of shares purchased | $ 19,536,000,000 | |||
| Affiliates | DT | ||||
| Equity, Class of Treasury Stock [Line Items] | ||||
| Additional shares purchased (in shares) | 3,300,000 | 0 | 0 | |
| Aggregate market value of shares purchased | $ 200,000,000 | |||
| 2017 Stock Repurchase Program | ||||
| Equity, Class of Treasury Stock [Line Items] | ||||
| Stock repurchase program, authorized amount | $ 1,500,000,000 | |||
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Amount of stock repurchase plan authorized. No definition available.
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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