Benefit Plans - Changes in Level 3 Plan Assets (Details) - Significant Unobservable Inputs (Level 3) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning balance	$ 2,149	$ 1,536
Net Realized and Unrealized Gains/ (Losses)	(11)	(62)
Net Purchases, Issuances and Settlements	(1,006)	702
Net Transfers Into/(Out of) Level 3	0	0
Currency Impact	89	(27)
Ending balance	1,221	2,149
Buy-in annuity contracts and other
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning balance	2,082	1,471
Net Realized and Unrealized Gains/ (Losses)	(12)	(62)
Net Purchases, Issuances and Settlements	(1,005)	702
Net Transfers Into/(Out of) Level 3	0	0
Currency Impact	89	(29)
Ending balance	1,154	2,082
Real estate
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning balance	63	62
Net Realized and Unrealized Gains/ (Losses)	1	0
Net Purchases, Issuances and Settlements	0	0
Net Transfers Into/(Out of) Level 3	0	0
Currency Impact	0	1
Ending balance	64	63
Private equity and other
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Beginning balance	4	3
Net Realized and Unrealized Gains/ (Losses)	0	0
Net Purchases, Issuances and Settlements	(1)	0
Net Transfers Into/(Out of) Level 3	0	0
Currency Impact	0	1
Ending balance	$ 3	$ 4