Employee Retirement Benefits - Fair Value of Pension Plan Assets (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Equity Securities [Member]
Fair value measurements of plan assets [Abstract]
Foreign investments	$ 481	$ 528
Equity Securities [Member] | Carrying Amount
Fair value measurements of plan assets [Abstract]
Fair value	1,325	1,311
Equity Securities [Member] | Level 1 | Carrying Amount
Fair value measurements of plan assets [Abstract]
Fair value	1,321	1,307
Equity Securities [Member] | Level 2 | Carrying Amount
Fair value measurements of plan assets [Abstract]
Fair value	3	3
Equity Securities [Member] | Level 3 | Carrying Amount
Fair value measurements of plan assets [Abstract]
Fair value	1	1
Equity Commingled Vehicles [Member]
Fair value measurements of plan assets [Abstract]
Foreign investments	495	186
Equity Commingled Vehicles [Member] | Carrying Amount
Fair value measurements of plan assets [Abstract]
Fair value	1,060	880
Equity Commingled Vehicles [Member] | Level 1 | Carrying Amount
Fair value measurements of plan assets [Abstract]
Fair value	0	0
Equity Commingled Vehicles [Member] | Level 2 | Carrying Amount
Fair value measurements of plan assets [Abstract]
Fair value	1,060	880
Equity Commingled Vehicles [Member] | Level 3 | Carrying Amount
Fair value measurements of plan assets [Abstract]
Fair value	0	0
U.S. Government And Municipal Bonds [Member] | Carrying Amount
Fair value measurements of plan assets [Abstract]
Fair value	143	211
U.S. Government And Municipal Bonds [Member] | Level 1 | Carrying Amount
Fair value measurements of plan assets [Abstract]
Fair value	139	207
U.S. Government And Municipal Bonds [Member] | Level 2 | Carrying Amount
Fair value measurements of plan assets [Abstract]
Fair value	4	4
U.S. Government And Municipal Bonds [Member] | Level 3 | Carrying Amount
Fair value measurements of plan assets [Abstract]
Fair value	0	0
Corporate debt securities [Member]
Fair value measurements of plan assets [Abstract]
Foreign investments	66	69
Corporate debt securities [Member] | Carrying Amount
Fair value measurements of plan assets [Abstract]
Fair value	263	248
Corporate debt securities [Member] | Level 1 | Carrying Amount
Fair value measurements of plan assets [Abstract]
Fair value	0	0
Corporate debt securities [Member] | Level 2 | Carrying Amount
Fair value measurements of plan assets [Abstract]
Fair value	263	248
Corporate debt securities [Member] | Level 3 | Carrying Amount
Fair value measurements of plan assets [Abstract]
Fair value	0	0
Asset-backed securities [Member]
Fair value measurements of plan assets [Abstract]
Foreign investments	202	185
Asset-backed securities [Member] | Carrying Amount
Fair value measurements of plan assets [Abstract]
Fair value	499	453
Asset-backed securities [Member] | Level 1 | Carrying Amount
Fair value measurements of plan assets [Abstract]
Fair value	0	0
Asset-backed securities [Member] | Level 2 | Carrying Amount
Fair value measurements of plan assets [Abstract]
Fair value	499	453
Asset-backed securities [Member] | Level 3 | Carrying Amount
Fair value measurements of plan assets [Abstract]
Fair value	0	0
Debt Security Commingled Vehicles [Member] | Carrying Amount
Fair value measurements of plan assets [Abstract]
Fair value	126	129
Debt Security Commingled Vehicles [Member] | Level 1 | Carrying Amount
Fair value measurements of plan assets [Abstract]
Fair value	0	0
Debt Security Commingled Vehicles [Member] | Level 2 | Carrying Amount
Fair value measurements of plan assets [Abstract]
Fair value	126	129
Debt Security Commingled Vehicles [Member] | Level 3 | Carrying Amount
Fair value measurements of plan assets [Abstract]
Fair value	0	0
Convertible securities [Member]
Fair value measurements of plan assets [Abstract]
Foreign investments	20	28
Convertible securities [Member] | Carrying Amount
Fair value measurements of plan assets [Abstract]
Fair value	263	281
Convertible securities [Member] | Level 1 | Carrying Amount
Fair value measurements of plan assets [Abstract]
Fair value	32	19
Convertible securities [Member] | Level 2 | Carrying Amount
Fair value measurements of plan assets [Abstract]
Fair value	231	262
Convertible securities [Member] | Level 3 | Carrying Amount
Fair value measurements of plan assets [Abstract]
Fair value	0	0
Total Investments
Fair value measurements of plan assets [Abstract]
Fair value	5,564	5,121
Foreign investments	289	274
Total Investments | Carrying Amount
Fair value measurements of plan assets [Abstract]
Fair value	3,679	3,513
Total Investments | Level 1 | Carrying Amount
Fair value measurements of plan assets [Abstract]
Fair value	1,492	1,533
Total Investments | Level 2 | Carrying Amount
Fair value measurements of plan assets [Abstract]
Fair value	2,186	1,979
Total Investments | Level 3 | Carrying Amount
Fair value measurements of plan assets [Abstract]
Fair value	1	1
Total Investments | Fair Value Measured at Net Asset Value Per Share | Carrying Amount
Fair value measurements of plan assets [Abstract]
Fair value	$ 1,885	$ 1,608