Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss by Component, After Tax and Minority Interest (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 4,823	$ 4,779	$ 5,452
Ending balance	3,403	4,823	4,779
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(3,844)	(3,835)	(3,875)
Other comprehensive income (loss) before reclassifications	(48)	(87)	(80)
Amounts reclassified from accumulated other comprehensive loss	304	78	120
Ending balance	(3,588)	(3,844)	(3,835)
Foreign Currency Translation Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(1,705)	(1,613)	(1,663)
Other comprehensive income (loss) before reclassifications	35	(92)	50
Amounts reclassified from accumulated other comprehensive loss	8	0	0
Ending balance	(1,662)	(1,705)	(1,613)
Unrealized Gains (Losses) from Securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	1	1	1
Other comprehensive income (loss) before reclassifications	0	0	0
Amounts reclassified from accumulated other comprehensive loss	0	0	0
Ending balance	1	1	1
Unrecognized Net Actuarial Losses and Prior Service Costs
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(2,140)	(2,224)	(2,215)
Other comprehensive income (loss) before reclassifications	(83)	5	(125)
Amounts reclassified from accumulated other comprehensive loss	296	79	116
Ending balance	(1,927)	(2,140)	(2,224)
Deferred Derivative Gains (Losses)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	0	1	2
Other comprehensive income (loss) before reclassifications	0	0	(5)
Amounts reclassified from accumulated other comprehensive loss	0	(1)	4
Ending balance	$ 0	$ 0	$ 1