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Significant Transactions (Universal Beijing Resort) (Details) $ in Millions, ¥ in Billions	Mar. 31, 2019 CNY (¥)	Mar. 31, 2019 USD ($)
Universal Beijing Resort [Member]
Variable Interest Entity [Line Items]
Ownership percentage in variable interest entity	30.00%	30.00%
Maximum borrowing capacity of variable interest entity	¥ 26.6	$ 4,000
Consolidated variable interest entity's assets included in condensed consolidated balance sheet		1,800
Consolidated variable interest entity's liabilities included in condensed consolidated balance sheet		$ 1,300
NBCUniversal Media LLC [Member] | Universal Beijing Resort [Member]
Variable Interest Entity [Line Items]
Ownership percentage in variable interest entity	30.00%	30.00%
Maximum borrowing capacity of variable interest entity	¥ 26.6	$ 4,000
Consolidated variable interest entity's assets included in condensed consolidated balance sheet		1,800
Consolidated variable interest entity's liabilities included in condensed consolidated balance sheet		1,300
NBCUniversal Media LLC [Member] | Universal Beijing Resort term loans [Member]
Variable Interest Entity [Line Items]
Proceeds from borrowings		815
Universal Beijing Resort term loans [Member]
Variable Interest Entity [Line Items]
Proceeds from borrowings		$ 815

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