Debt and Other Financing Arrangements - Senior Notes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Mar. 17, 2021	Mar. 03, 2021
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt	$ 0	$ 0	$ 8	$ 0
Senior Notes | 5 3/8% Senior Notes due 2024
Debt Instrument [Line Items]
Stated rate	5.375%		5.375%
Senior Notes | 5.000% Senior Notes due 2026
Debt Instrument [Line Items]
Stated rate	5.00%		5.00%
Senior Notes | 5.000% Euro Fixed Rate Notes due 2024
Debt Instrument [Line Items]
Stated rate	5.00%		5.00%			5.00%
Senior Notes | 5.125% Senior Secured Notes Due 2029
Debt Instrument [Line Items]
Stated rate	5.125%		5.125%		5.125%