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Common Stock (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Treasury stock acquired (shares) |  | 4,960,752 |  |  | 5,833,667 |  |  | 16,627,760 | 13,328,430
Value of treasury stock shares repurchased/withheld |  | $ 3,666 | $ 3,516 | $ 3,652 | $ 3,361 | $ 1,155 | $ 2,352 | $ 10,834 | $ 6,868
Remaining authorized repurchase amount |  | $ 1,500 |  |  |  |  |  | $ 1,500 |
Issuance of equity |  |  |  |  |  |  | $ 23 |  | $ 23
Liberty Broadband |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Issuance of equity, shares |  |  |  |  |  |  |  |  | 35,112
A/N |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Issuance of equity, shares |  |  |  |  |  |  |  |  | 20,182
Share buybacks |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Treasury stock acquired (shares) |  | 4,738,842 |  |  | 5,466,295 |  |  | 15,442,417 | 11,947,078
Value of treasury stock shares repurchased/withheld |  | $ 3,584 |  |  | $ 3,250 |  |  | $ 10,450 | $ 6,452
Share buybacks | Liberty Broadband |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Treasury stock acquired (shares) |  | 1,200,547 |  |  |  |  |  | 3,962,155 |
Value of treasury stock shares repurchased/withheld |  | $ 880 |  |  |  |  |  | $ 2,642 |
Share buybacks | Liberty Broadband | Subsequent Event |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Treasury stock acquired (shares) | 700,000 |  |  |  |  |  |  |  |
Value of treasury stock shares repurchased/withheld | $ 561 |  |  |  |  |  |  |  |
Income tax withholding |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Treasury stock acquired (shares) |  | 104,949 |  |  | 186,548 |  |  | 572,869 | 769,853
Value of treasury stock shares repurchased/withheld |  | $ 82 |  |  | $ 111 |  |  | $ 384 | $ 416
Exercise cost |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Treasury stock acquired (shares) |  | 116,961 |  |  | 180,824 |  |  | 612,474 | 611,499

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