Quarterly Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Total net revenue	$ 679	$ 767	$ 685	$ 755	$ 735	$ 720	$ 710	$ 708	$ 2,886	$ 2,873	$ 2,366
Net income	$ 172	$ 274	$ 219	$ 290	$ 270	$ 285	$ 250	$ 247	$ 955	$ 1,052	$ 614
Earnings per share:
Basic (in dollars per share)	$ 0.76	$ 1.08	$ 0.90	$ 1.10	$ 1.07	$ 1.01	$ 0.95	$ 0.88	$ 3.86	$ 3.90	$ 2.16
Diluted (in dollars per share)	$ 0.76	$ 1.08	$ 0.90	$ 1.09	$ 1.06	$ 1.00	$ 0.95	$ 0.88	$ 3.85	$ 3.88	$ 2.15
Restructuring activities	$ 21								$ 21	$ 4	$ 12
Impairment of technology asset	$ 8								8
Pre-tax losses from balance sheet repositioning			$ 80						$ 80	$ 54	$ 0