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Debt (Senior Notes) (Details) € in Millions		1 Months Ended
Debt (Senior Notes) (Details) € in Millions	Aug. 18, 2025 USD ($)	Jan. 31, 2025 USD ($)	Mar. 31, 2026 USD ($)	Mar. 31, 2026 EUR (€)	Mar. 31, 2025 USD ($)	Aug. 31, 2021 USD ($)
Debt Instrument [Line Items]
Long-term debt, carrying value			$ 6,572,000,000		$ 5,790,000,000
Long-term debt, principal			$ 6,619,000,000		5,832,000,000
ABL Revolver
Debt Instrument [Line Items]
Extinguishment of debt		$ 738,000,000
Long-term debt, principal		738,000,000
Senior Notes
Debt Instrument [Line Items]
Interest rate			4.75%	4.75%
Principal amount			$ 1,600,000,000
Senior Notes \| 3.250% Senior Notes, due November 2026
Debt Instrument [Line Items]
Interest rate						3.25%
Principal amount						$ 750,000,000
Long-term debt, carrying value			13,000,000		747,000,000
Debt issuance costs, net						$ 11,000,000
Long-term debt, principal			$ 13,000,000		750,000,000
Senior Notes \| 3.375% Senior Notes, due April 2029
Debt Instrument [Line Items]
Interest rate			3.375%	3.375%
Principal amount \| €				€ 500
Long-term debt, carrying value			$ 571,000,000		533,000,000
Debt issuance costs, gross					13,000,000
Long-term debt, principal			$ 576,000,000		540,000,000
Senior Notes \| 4.750% Senior Notes, due January 2030
Debt Instrument [Line Items]
Interest rate			4.75%	4.75%
Long-term debt, carrying value			$ 1,588,000,000		1,585,000,000
Long-term debt, principal			$ 1,600,000,000		1,600,000,000
Senior Notes \| 3.875% Senior Notes, due August 2031
Debt Instrument [Line Items]
Interest rate			3.875%	3.875%
Long-term debt, carrying value			$ 744,000,000		743,000,000
Long-term debt, principal			$ 750,000,000		750,000,000
Senior Notes \| 6.875% Senior Notes, due January 2030
Debt Instrument [Line Items]
Interest rate			6.875%	6.875%
Principal amount		750,000,000
Long-term debt, carrying value			$ 741,000,000		739,000,000
Debt issuance costs, gross		$ 12,000,000
Interest rates		6.875%	6.875%	6.875%
Long-term debt, principal			$ 750,000,000		750,000,000
Senior Notes \| 6.375% Senior Notes due August 2033
Debt Instrument [Line Items]
Interest rate	6.375%
Principal amount	$ 750,000,000
Long-term debt, carrying value			739,000,000		0
Long-term debt, principal			$ 750,000,000		$ 0
Senior Notes \| 5.875% Senior Notes due September 2026
Debt Instrument [Line Items]
Interest rate						5.875%
Extinguishment of debt	737,000,000
Long-term debt, carrying value	750,000,000
Debt discount	9,000,000
Debt issuance costs, net	$ 3,000,000
Interest rates						5.875%
Senior Notes \| Senior Notes Due 2030
Debt Instrument [Line Items]
Interest rate			4.75%	4.75%
3.875% Senior Notes, due August 2031
Debt Instrument [Line Items]
Debt issuance costs, gross			$ 11,000,000
Long-term debt, principal			750,000,000
3.250% Senior Notes, due November 2026
Debt Instrument [Line Items]
Debt issuance costs, gross			$ 11,000,000