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Unaudited Quaterly Financial Information - Unaudited Quarterly Results of Operations (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 26, 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
Quarterly Financial Data [Abstract]
Net revenue	$ 1,501	$ 1,362	$ 1,029	$ 1,179	$ 1,304	$ 1,226	$ 1,242	$ 1,216	$ 5,071	$ 4,988
Gross profit	423	370	236	284	313	309	323	332	1,313	1,277	$ 1,425
Net income (loss)	$ 59	$ 75	$ (76)	$ (21)	$ (9)	$ 8	$ (11)	$ 48	$ 37	$ 36	$ 405
Earnings (loss) per share - basic	$ 0.45	$ 0.61	$ (0.62)	$ (0.17)	$ (0.07)	$ 0.07	$ (0.09)	$ 0.39	$ 0.30	$ 0.29	$ 3.31
Earnings (loss) per share - diluted	$ 0.44	$ 0.60	$ (0.62)	$ (0.17)	$ (0.07)	$ 0.06	$ (0.09)	$ 0.39	$ 0.29	$ 0.29	$ 3.30

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-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 924
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 11.L)
-URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856

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