Quarterly Results (Unaudited) - Quarterly Financial Results (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue from Contract with Customer, Excluding Assessed Tax, Total	$ 2,108	$ 1,994	$ 1,078	$ 1,926	$ 1,987	$ 2,164	$ 2,306	$ 2,163	$ 7,106	$ 8,620	$ 8,143
Gross margin	211	214	(10)	206	223	282	326	300
Net income (loss)	39	45	(173)	38	86	112	(66)	101	(51)	233	440
Net income (loss) attributable to the parent company	$ 40	$ 45	$ (174)	$ 58	$ 85	$ 111	$ (68)	$ 98	$ (31)	$ 226	$ 427
Basic (in dollars per share)	$ 0.28	$ 0.31	$ (1.20)	$ 0.40	$ 0.59	$ 0.77	$ (0.47)	$ 0.68	$ (0.21)	$ 1.57	$ 2.94
Diluted (in dollars per share)	$ 0.27	$ 0.31	$ (1.20)	$ 0.40	$ 0.58	$ 0.77	$ (0.47)	$ 0.68	$ (0.21)	$ 1.56	$ 2.91