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Derivative Financial Instruments (Schedule of Derivative Instruments, Fair Value) (Details) £ in Millions	Sep. 30, 2020 USD ($)	Sep. 30, 2020 GBP (£)	Dec. 31, 2019 USD ($)
Derivatives, Fair Value [Line Items]
Amounts eligible to be offset under master netting agreements	$ 0		$ 0
Long-term debt, gross	15,764,000,000		15,544,000,000
Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Derivative assets	47,000,000		88,000,000
Other noncurrent assets
Derivatives, Fair Value [Line Items]
Derivative assets	87,000,000		137,000,000
Accrued liabilities
Derivatives, Fair Value [Line Items]
Derivative liability	12,000,000		25,000,000
Other noncurrent liabilities
Derivatives, Fair Value [Line Items]
Derivative liability	338,000,000		165,000,000
Not Designated as Hedging Instrument \| Foreign exchange
Derivatives, Fair Value [Line Items]
Notional	1,044,000,000		1,177,000,000
Not Designated as Hedging Instrument \| Foreign exchange \| Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Derivative assets, Fair Value	0		0
Not Designated as Hedging Instrument \| Foreign exchange \| Other noncurrent assets
Derivatives, Fair Value [Line Items]
Derivative assets, Fair Value	0		0
Not Designated as Hedging Instrument \| Foreign exchange \| Accrued liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, Fair Value	2,000,000		13,000,000
Not Designated as Hedging Instrument \| Foreign exchange \| Other noncurrent liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, Fair Value	71,000,000		50,000,000
Not Designated as Hedging Instrument \| Cross-currency swaps
Derivatives, Fair Value [Line Items]
Notional	139,000,000		279,000,000
Not Designated as Hedging Instrument \| Cross-currency swaps \| Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Derivative assets, Fair Value	3,000,000		3,000,000
Not Designated as Hedging Instrument \| Cross-currency swaps \| Other noncurrent assets
Derivatives, Fair Value [Line Items]
Derivative assets, Fair Value	0		0
Not Designated as Hedging Instrument \| Cross-currency swaps \| Accrued liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, Fair Value	0		0
Not Designated as Hedging Instrument \| Cross-currency swaps \| Other noncurrent liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, Fair Value	5,000,000		5,000,000
Not Designated as Hedging Instrument \| Equity (Lionsgate Collar)
Derivatives, Fair Value [Line Items]
Notional	0		65,000,000
Not Designated as Hedging Instrument \| Equity (Lionsgate Collar) \| Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Derivative assets, Fair Value	0		19,000,000
Not Designated as Hedging Instrument \| Equity (Lionsgate Collar) \| Other noncurrent assets
Derivatives, Fair Value [Line Items]
Derivative assets, Fair Value	0		18,000,000
Not Designated as Hedging Instrument \| Equity (Lionsgate Collar) \| Accrued liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, Fair Value	0		0
Not Designated as Hedging Instrument \| Equity (Lionsgate Collar) \| Other noncurrent liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, Fair Value	0		0
Cash Flow Hedging \| Designated as Hedging Instrument \| Foreign exchange
Derivatives, Fair Value [Line Items]
Notional	1,109,000,000		1,631,000,000
Cash Flow Hedging \| Designated as Hedging Instrument \| Foreign exchange \| Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Derivative assets, Fair Value	9,000,000		29,000,000
Cash Flow Hedging \| Designated as Hedging Instrument \| Foreign exchange \| Other noncurrent assets
Derivatives, Fair Value [Line Items]
Derivative assets, Fair Value	21,000,000		7,000,000
Cash Flow Hedging \| Designated as Hedging Instrument \| Foreign exchange \| Accrued liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, Fair Value	10,000,000		5,000,000
Cash Flow Hedging \| Designated as Hedging Instrument \| Foreign exchange \| Other noncurrent liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, Fair Value	0		16,000,000
Cash Flow Hedging \| Designated as Hedging Instrument \| Interest rate swaps
Derivatives, Fair Value [Line Items]
Notional	2,000,000,000		400,000,000
Cash Flow Hedging \| Designated as Hedging Instrument \| Interest rate swaps \| Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Derivative assets, Fair Value	0		0
Cash Flow Hedging \| Designated as Hedging Instrument \| Interest rate swaps \| Other noncurrent assets
Derivatives, Fair Value [Line Items]
Derivative assets, Fair Value	0		38,000,000
Cash Flow Hedging \| Designated as Hedging Instrument \| Interest rate swaps \| Accrued liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, Fair Value	0		0
Cash Flow Hedging \| Designated as Hedging Instrument \| Interest rate swaps \| Other noncurrent liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, Fair Value	173,000,000		0
Net investment hedges \| Designated as Hedging Instrument \| Sterling Notes
Derivatives, Fair Value [Line Items]
Long-term debt, gross	514,000,000	£ 400
Net investment hedges \| Designated as Hedging Instrument \| Foreign exchange
Derivatives, Fair Value [Line Items]
Notional	52,000,000		52,000,000
Net investment hedges \| Designated as Hedging Instrument \| Foreign exchange \| Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Derivative assets, Fair Value	0		0
Net investment hedges \| Designated as Hedging Instrument \| Foreign exchange \| Other noncurrent assets
Derivatives, Fair Value [Line Items]
Derivative assets, Fair Value	7,000,000		4,000,000
Net investment hedges \| Designated as Hedging Instrument \| Foreign exchange \| Accrued liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, Fair Value	0		0
Net investment hedges \| Designated as Hedging Instrument \| Foreign exchange \| Other noncurrent liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, Fair Value	0		0
Net investment hedges \| Designated as Hedging Instrument \| Cross-currency swaps
Derivatives, Fair Value [Line Items]
Notional	3,444,000,000		3,535,000,000
Net investment hedges \| Designated as Hedging Instrument \| Cross-currency swaps \| Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Derivative assets, Fair Value	35,000,000		37,000,000
Net investment hedges \| Designated as Hedging Instrument \| Cross-currency swaps \| Other noncurrent assets
Derivatives, Fair Value [Line Items]
Derivative assets, Fair Value	59,000,000		70,000,000
Net investment hedges \| Designated as Hedging Instrument \| Cross-currency swaps \| Accrued liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, Fair Value	0		7,000,000
Net investment hedges \| Designated as Hedging Instrument \| Cross-currency swaps \| Other noncurrent liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, Fair Value	$ 89,000,000		$ 94,000,000