Capital Stock - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended	6 Months Ended
	May 05, 2020	Jun. 30, 2020	Jun. 30, 2020	May 06, 2020	Dec. 31, 2019	Apr. 26, 2018
Equity, Class of Treasury Stock [Line Items]
Treasury stock (in shares)		130,670,000	130,670,000		126,893,000
Authorized share repurchase					20,000,000	15,000,000
Stock repurchases (in shares)			3,400,000
Stock repurchased, value			$ 370
Average repurchase price per share (in dollars per share)			$ 109.88
Shares authorized and remaining under the repurchase program		23,300,000	23,300,000
Closing fees, paid	$ 12
Issuance of preferred dividend		$ 17	$ 17
Preferred dividends declared per common share (in dollars per share)		$ 14.02	$ 14.02
Additional paid-in capital
Equity, Class of Treasury Stock [Line Items]
Common stock warrants, net of issuance costs		$ 110
Issuance of preferred dividend		$ 17	$ 17
Common stock
Equity, Class of Treasury Stock [Line Items]
Treasury stock (in shares)		123,400,000	123,400,000		119,600,000
Class B Common Stock
Equity, Class of Treasury Stock [Line Items]
Treasury stock (in shares)		7,300,000	7,300,000		7,300,000
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001	$ 0.0001		$ 0.0001
Series A Preferred Stock
Equity, Class of Treasury Stock [Line Items]
Preferred stock, par value (in dollars per share)		$ 0.001	$ 0.001		$ 0.001
Common stock, voting power, percentage	50.00%			20.00%
Preferred stock, dividend rate, percentage	9.50%
Preferred stock, liquidation preference, percent	105.00%
Preferred stock, liquidation preference (in dollars per share)	$ 1,000
Series A Preferred Stock		$ 1,022	$ 1,022		$ 0
Initial discount and issuance costs related to preferred stock (in shares)			68,000,000
Issuance of preferred dividend			$ 17
Preferred dividends declared per common share (in dollars per share)		$ 14.02
Warrant
Equity, Class of Treasury Stock [Line Items]
Common stock, voting power, percentage	50.00%
Class of warrant or right, expiration period	10 years
Upon the occurrence of certain change of control triggering events | Series A Preferred Stock
Equity, Class of Treasury Stock [Line Items]
Preferred stock, liquidation preference, percent	103.00%
Notes prior to November 15, 2029 | Series A Preferred Stock
Equity, Class of Treasury Stock [Line Items]
Preferred stock, liquidation preference, percent	102.00%
Notes on or after November 15, 2029 | Series A Preferred Stock
Equity, Class of Treasury Stock [Line Items]
Preferred stock, liquidation preference, percent	101.00%
Apollo Purchaser
Equity, Class of Treasury Stock [Line Items]
Proceeds from issuance of private placement	$ 588
Apollo Purchaser | Series A Preferred Stock
Equity, Class of Treasury Stock [Line Items]
Preferred stock, par value (in dollars per share)	$ 0.001
Sale of stock, number of shares issued in transaction (in shares)	600,000
Apollo Purchaser | Warrant
Equity, Class of Treasury Stock [Line Items]
Common stock, par value (in dollars per share)	$ 0.0001
Warrants purchased (in shares)	4,200,000
Class of warrant or right, exercise price of warrants or rights	$ 72.00
Silver Lake Purchaser
Equity, Class of Treasury Stock [Line Items]
Proceeds from issuance of private placement	$ 588
Silver Lake Purchaser | Series A Preferred Stock
Equity, Class of Treasury Stock [Line Items]
Sale of stock, number of shares issued in transaction (in shares)	600,000
Silver Lake Purchaser | Warrant
Equity, Class of Treasury Stock [Line Items]
Warrants purchased (in shares)	4,200,000
Class of warrant or right, exercise price of warrants or rights	$ 72.00
2.5% (€650 million) senior notes due 2022
Equity, Class of Treasury Stock [Line Items]
Debt, interest rate (percentage)		2.50%	2.50%