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Debt (Financing Transactions) (Details) € in Millions	1 Months Ended	3 Months Ended
	Apr. 30, 2021 USD ($)	Mar. 31, 2021 USD ($) group	Mar. 31, 2020 USD ($)	Apr. 30, 2021 EUR (€)	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Number of borrowing groups | group		3
Non-cash borrowings and repayments		$ 0	$ 3,500,000,000
Outstanding debt		$ 13,777,900,000			$ 14,441,200,000
UPC Facility AZ | UPC Holding | Subsequent Event
Debt Instrument [Line Items]
Interest rate	4.875%			4.875%
UPC Facility AK | UPC Holding | Subsequent Event
Debt Instrument [Line Items]
Outstanding debt	$ 634,500,000			€ 540.0
UPC Facility AV | UPC Holding | Subsequent Event
Debt Instrument [Line Items]
Outstanding debt	600,000,000.0
UPC Facility AW | UPC Holding | Subsequent Event
Debt Instrument [Line Items]
Outstanding debt	940,000,000.0			€ 800.0
UPC Facility AX | UPC Holding | Subsequent Event
Debt Instrument [Line Items]
Principal amount of debt	$ 1,925,000,000.0
Issued at par percentage	99.00%			99.00%
UPC Facility AX | UPC Holding | LIBOR | Subsequent Event
Debt Instrument [Line Items]
Basis spread on variable rate	3.00%
Floor rate	0.00%			0.00%
UPC Facility AY | UPC Holding | Subsequent Event
Debt Instrument [Line Items]
Principal amount of debt	$ 1,013,400,000			€ 862.5
Issued at par percentage	99.75%			99.75%
UPC Facility AY | UPC Holding | EURIBOR | Subsequent Event
Debt Instrument [Line Items]
Basis spread on variable rate	3.00%
Floor rate	0.00%			0.00%
UPC Facility AV1 | UPC Holding | Subsequent Event
Debt Instrument [Line Items]
Outstanding debt	$ 1,300,000,000.0
UPC Facility AV2 | UPC Holding | Subsequent Event
Debt Instrument [Line Items]
Principal amount of debt	1,300,000,000.0
Outstanding debt	2,600,000,000.0
UPC Facility AW1 | UPC Holding | Subsequent Event
Debt Instrument [Line Items]
Outstanding debt	400,000,000.0
UPC Facility AW2 | UPC Holding | Subsequent Event
Debt Instrument [Line Items]
Principal amount of debt	470,000,000.0			€ 400.0
Outstanding debt	940,000,000.0			€ 800.0
UPC facility AV and UPC facility AV2 | UPC Holding | Subsequent Event
Debt Instrument [Line Items]
Outstanding debt	2,000,000,000.0
UPC Holding Dollar Denominated Senior Secured Notes | UPC Holding | Subsequent Event
Debt Instrument [Line Items]
Principal amount of debt	$ 1,250,000,000.0

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