Earnings (Loss) Per Common Share (Earrings Per Share Basic and Diluted) (Details) - shares shares in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2018 |
Sep. 30, 2017 |
Sep. 30, 2018 |
Sep. 30, 2017 |
|
| Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] | ||||
| Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 28 | 16 | 28 | 16 |
| Basic EPS (WA shares outstanding) | 459 | 448 | 467 | 451 |
| Potentially dilutive shares | 2 | 4 | 4 | 3 |
| Diluted EPS (WA shares outstanding) | 461 | 452 | 471 | 454 |
| Liberty Ventures common stock | ||||
| Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] | ||||
| Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 0 | 0 | 2 | 0 |
| Basic EPS (WA shares outstanding) | 86 | 86 | 85 | |
| Potentially dilutive shares | 1 | 1 | 1 | |
| Diluted EPS (WA shares outstanding) | 87 | 87 | 86 | |
| X | ||||||||||
- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- 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.
|
| X | ||||||||||
- Definition The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Details
|