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Background and Basis of Presentation (Narrative) (Details) - USD ($) |  | 3 Months Ended | 5 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 29, 2021 | Jun. 30, 2021 | Apr. 29, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Jan. 31, 2021 | Apr. 30, 2020 | Jul. 31, 2019
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Payments to acquire additional interest in subsidiaries |  |  | $ 250,000,000 |  |  |  |  |
July 2019 Share Repurchase Program [Member] |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Planned share repurchase program |  |  |  |  |  |  |  | $ 1,000,000,000.0
Stock repurchase program, rescinded authorized repurchase amount |  |  |  |  |  |  | $ 500,000,000 |
Repurchase of common stock (shares) |  |  |  |  | 0 |  |  |
January 2021 Share Repurchase Program [Member] |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Planned share repurchase program |  |  |  |  |  | $ 2,000,000,000.0 |  |
Repurchase of common stock (shares) |  | 6,600,000 |  | 13,500,000 |  |  |  |
Stock repurchase program, remaining authorized repurchase amount |  | $ 1,350,000,000 |  | $ 1,350,000,000 |  |  |  |
Helix Innovations LLC [Member] |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Noncontrolling interest, remaining interest purchased by parent |  |  | 20.00% |  |  |  |  |
Subsidiary ownership percentage | 100.00% |  |  |  |  |  |  |
Subsidiary ownership percentage | 100.00% |  |  |  |  |  |  |

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