Consolidated Statement of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Net Revenue	$ 3,898	$ 3,398	$ 11,143	$ 9,185
Operating Expenses
General and administrative	1,236	1,136	3,684	3,162
Advertising and marketing	235	203	694	587
Depreciation and amortization	111	118	346	321
Provision for litigation settlements	29	0	371	15
Total operating expenses	1,611	1,457	5,095	4,085
Operating income	2,287	1,941	6,048	5,100
Other Income (Expense)
Investment income	31	15	79	44
Interest expense	(48)	(35)	(139)	(113)
Other income (expense), net	(6)	11	1	7
Total other income (expense)	(23)	(9)	(59)	(62)
Income before income taxes	2,264	1,932	5,989	5,038
Income tax expense	365	502	1,029	1,350
Net Income	$ 1,899	$ 1,430	$ 4,960	$ 3,688
Basic Earnings per Share	$ 1.83	$ 1.34	$ 4.75	$ 3.45
Basic Weighted-Average Shares Outstanding	1,037	1,063	1,044	1,071
Diluted Earnings per Share	$ 1.82	$ 1.34	$ 4.73	$ 3.43
Diluted Weighted-Average Shares Outstanding	1,043	1,068	1,050	1,075