Employee Postretirement Benefits (Principal Plans and All Other Pension Plans) (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Total
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation (“PBO”)	$ 2,210	$ 2,198	$ 2,428
Accumulated benefit obligation (“ABO”)	2,165	2,157
Fair value of plan assets	2,095	2,060	$ 2,295
Principal Plans
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation (“PBO”)	1,897	1,900
Accumulated benefit obligation (“ABO”)	1,897	1,900
Fair value of plan assets	1,819	1,795
All Other Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation (“PBO”)	313	298
Accumulated benefit obligation (“ABO”)	268	257
Fair value of plan assets	$ 276	$ 265