Shareholders’ Equity - Components of Accumulated Other Comprehensive Loss, Net of Related Tax (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 6,305	$ (742)	$ (429)
Total other comprehensive income (expense)	902	(372)	249
Ending Balance	9,459	6,305	(742)
AOCI attributable to parent
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(4,745)	(4,373)	(4,623)
Other comprehensive income (loss) before reclassifications	795	(490)	74
Tax benefit (expense)	3	13	52
Other comprehensive income (loss) before reclassifications, net	798	(477)	126
Amounts reclassified from accumulated other comprehensive income (loss)	140	141	167
Tax benefit (expense)	(36)	(36)	(43)
Amounts reclassified from accumulated other comprehensive income (loss), net	104	105	124
Total other comprehensive income (expense)	902	(372)	250
Ending Balance	(3,843)	(4,745)	(4,373)
Change in Fair Value of Investments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	74	2	(11)
Other comprehensive income (loss) before reclassifications	14	99	8
Tax benefit (expense)	(3)	(26)	(1)
Other comprehensive income (loss) before reclassifications, net	11	73	7
Amounts reclassified from accumulated other comprehensive income (loss)	(8)	(2)	8
Tax benefit (expense)	1	1	(2)
Amounts reclassified from accumulated other comprehensive income (loss), net	(7)	(1)	6
Total other comprehensive income (expense)	4	72	13
Ending Balance	78	74	2
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(2,051)	(1,584)	(1,861)
Other comprehensive income (loss) before reclassifications	839	(479)	278
Tax benefit (expense)	(13)	12	(1)
Other comprehensive income (loss) before reclassifications, net	826	(467)	277
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	0
Tax benefit (expense)	0	0	0
Amounts reclassified from accumulated other comprehensive income (loss), net	0	0	0
Total other comprehensive income (expense)	826	(467)	277
Ending Balance	(1,225)	(2,051)	(1,584)
Post-retirement Benefit Obligations
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(2,768)	(2,791)	(2,751)
Other comprehensive income (loss) before reclassifications	(58)	(110)	(212)
Tax benefit (expense)	19	27	54
Other comprehensive income (loss) before reclassifications, net	(39)	(83)	(158)
Amounts reclassified from accumulated other comprehensive income (loss)	148	143	159
Tax benefit (expense)	(37)	(37)	(41)
Amounts reclassified from accumulated other comprehensive income (loss), net	111	106	118
Total other comprehensive income (expense)	72	23	(40)
Ending Balance	$ (2,696)	$ (2,768)	$ (2,791)