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Segment Information (Reconciliation of Adjusted EBITDA from Segment to Consolidated Statements) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Adjusted EBITDA | $ 34,258 | $ 30,165 | $ 27,956
Adjustment for legal settlement | 0 | (125) | (250)
Adjustment for Sky transaction-related costs | (180) | (355) | 0
Depreciation | (8,663) | (8,281) | (7,914)
Amortization | (4,290) | (2,736) | (2,216)
Other operating gains | 0 | 341 | 442
Interest expense | (4,567) | (3,542) | (3,086)
Investment and other income (loss), net | 438 | (225) | 421
Income (loss) before income taxes | 16,996 | 15,242 | 15,353
NBCUniversal Media LLC [Member] |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Adjusted EBITDA | 8,755 | 8,633 | 8,181
Depreciation | (1,023) | (1,001) | (994)
Amortization | (1,106) | (1,107) | (1,047)
Other operating gains | 0 | 141 | 337
Interest expense | (738) | (489) | (727)
Investment and other income (loss), net | 396 | (521) | (144)
Income (loss) before income taxes | $ 6,284 | $ 5,656 | $ 5,606

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