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Debt - Narrative (Details) $ in Millions	3 Months Ended
Debt - Narrative (Details) $ in Millions	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2021 EUR (€)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 EUR (€)
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 7,935		$ 8,141
Fair Value, Inputs, Level 2
Debt Instrument [Line Items]
Long-term debt, fair value		8,330		8,617
Senior Notes \| €650 at 4.0% due 2022
Debt Instrument [Line Items]
Debt, face amount \| €			€ 650,000,000
Long-term Debt, Gross		$ 753		794
Debt Instrument, Interest Rate, Stated Percentage		4.00%	4.00%
Senior Notes \| U. S. dollar at 4.50% due 2023
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 1,000		1,000
Debt Instrument, Interest Rate, Stated Percentage		4.50%	4.50%
Senior Secured Borrowings \| U.S. Dollar at LIBOR Plus One Point Five Due Two Thousand Twenty Four [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 1,009		1,029
Senior Secured Borrowings \| Euro at EURIBOR Plus One Point Five Percentage Due Two Thousand and Twenty Four [Member]
Debt Instrument [Line Items]
Debt, face amount \| €			€ 308,000,000		€ 317,000,000
Long-term Debt, Gross		$ 357		$ 387
Subsequent Event \| Forecast
Debt Instrument [Line Items]
Gain (Loss) on Extinguishment of Debt	$ 67