Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	May 22, 2026
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	$ 5,522	$ 4,792	$ 5,353	$ 4,554
Other comprehensive income:
Total Other comprehensive (loss) income, net of tax	(6)	81	(24)	129
Balance at end of period	$ 5,732	5,042	$ 5,732	5,042
6.750% Bonds, due 2028 | Bonds
Accumulated Other Comprehensive Income (Loss) [Line Items]
Long-term debt, interest rate (as a percent)	6.75%		6.75%		6.75%
4.850% Notes, due 2031 | Notes
Accumulated Other Comprehensive Income (Loss) [Line Items]
Long-term debt, interest rate (as a percent)	4.85%		4.85%
Accumulated other comprehensive loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	$ (1,691)	(1,830)	$ (1,673)	(1,878)
Other comprehensive income:
Total Other comprehensive (loss) income, net of tax	(6)	81	(24)	129
Balance at end of period	(1,697)	(1,749)	(1,697)	(1,749)
Pension and other postretirement benefits
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(588)	(669)	(592)	(672)
Other comprehensive income:
Other comprehensive income (loss) before reclassifications, before tax	0	1	0	0
Tax benefit (expense)	0	0	0	1
Total Other comprehensive income (loss) before reclassifications, net of tax	0	1	0	1
Reclassification from other comprehensive income (loss), before tax	5	3	10	6
Tax (expense) benefit	(1)	(1)	(2)	(1)
Total amount reclassified from Accumulated other comprehensive (loss) income, net of tax	4	2	8	5
Total Other comprehensive (loss) income, net of tax	4	3	8	6
Balance at end of period	(584)	(666)	(584)	(666)
Foreign currency translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(1,084)	(1,162)	(1,052)	(1,207)
Other comprehensive income:
Total Other comprehensive (loss) income, net of tax	(10)	117	(42)	162
Balance at end of period	(1,094)	(1,045)	(1,094)	(1,045)
Cash flow hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(19)	1	(29)	1
Other comprehensive income:
Other comprehensive income (loss) before reclassifications, before tax	1	(49)	14	(50)
Tax benefit (expense)	0	11	(3)	11
Total Other comprehensive income (loss) before reclassifications, net of tax	1	(38)	11	(39)
Reclassification from other comprehensive income (loss), before tax	(1)	(2)	(1)	0
Tax (expense) benefit	0	1	0	0
Total amount reclassified from Accumulated other comprehensive (loss) income, net of tax	(1)	(1)	(1)	0
Total Other comprehensive (loss) income, net of tax	0	(39)	10	(39)
Balance at end of period	$ (19)	$ (38)	$ (19)	$ (38)