Description of Business and Basis of Presentation (Details)	3 Months Ended	9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2020 USD ($) segment	Sep. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Aug. 11, 2017 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of reportable segments | segment		2
Goodwill impairment charge	$ 38,000,000	$ 36,000,000
Repayments of revolving credit facility		500,000,000	$ 225,000,000
Content rights and prepaid license fees, net	389,000,000	389,000,000				$ 579,000,000
Equity adjustment	11,597,000,000	11,597,000,000	11,133,000,000	$ 11,358,000,000	$ 10,962,000,000	11,524,000,000	$ 11,221,000,000	$ 10,300,000,000	$ 10,102,000,000
Cumulative Effect, Period Of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity adjustment					(3,000,000)	2,000,000		5,000,000	0
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity adjustment	8,278,000,000	8,278,000,000	$ 6,859,000,000	7,980,000,000	7,712,000,000	7,333,000,000	$ 6,616,000,000	5,663,000,000	5,254,000,000
Retained Earnings | Cumulative Effect, Period Of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity adjustment					$ (3,000,000)	2,000,000		$ 5,000,000	$ 30,000,000
Retained Earnings | Accounting Standards Update 2016-13 | Cumulative Effect, Period Of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity adjustment						$ 2,000,000
Line of Credit | Revolving Credit Facility
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revolving line of credit, maximum borrowing capacity										$ 2,500,000,000
Outstanding borrowings				500,000,000
Repayments of revolving credit facility		500,000,000
Senior Notes | 3.625% Senior notes, semi-annual interest, due May 2030
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Face amount				1,000,000,000.0
Senior Notes | 4.650% Senior notes, semi-annual interest, due May 2050
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Face amount				$ 1,000,000,000.0
Senior Notes | Senior Notes Due 2021 Through 2023
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Repurchased face amount	$ 1,500,000,000	$ 1,500,000,000