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Employee Retirement Benefits - Fair Value of Pension Plan Assets (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Equity Securities [Member] |  |
Fair value measurements of plan assets [Abstract] |  |
Foreign investments | $ 528 | $ 591
Equity Securities [Member] | Carrying Amount |  |
Fair value measurements of plan assets [Abstract] |  |
Fair value | 1,311 | 1,450
Equity Securities [Member] | Level 1 | Carrying Amount |  |
Fair value measurements of plan assets [Abstract] |  |
Fair value | 1,307 | 1,444
Equity Securities [Member] | Level 2 | Carrying Amount |  |
Fair value measurements of plan assets [Abstract] |  |
Fair value | 3 | 5
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 | 186 | 222
Equity Commingled Vehicles [Member] | Carrying Amount |  |
Fair value measurements of plan assets [Abstract] |  |
Fair value | 880 | 754
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 | 880 | 754
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 | 211 | 101
U.S. Government And Municipal Bonds [Member] | Level 1 | Carrying Amount |  |
Fair value measurements of plan assets [Abstract] |  |
Fair value | 207 | 96
U.S. Government And Municipal Bonds [Member] | Level 2 | Carrying Amount |  |
Fair value measurements of plan assets [Abstract] |  |
Fair value | 4 | 5
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 | 69 | 72
Corporate debt securities [Member] | Carrying Amount |  |
Fair value measurements of plan assets [Abstract] |  |
Fair value | 248 | 252
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 | 248 | 252
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 | 185 | 157
Asset-backed securities [Member] | Carrying Amount |  |
Fair value measurements of plan assets [Abstract] |  |
Fair value | 453 | 500
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 | 453 | 500
Asset-backed securities [Member] | Level 3 | Carrying Amount |  |
Fair value measurements of plan assets [Abstract] |  |
Fair value | 0 | 0
Debt Security Commingled Vehicles [Member] |  |
Fair value measurements of plan assets [Abstract] |  |
Foreign investments |  | 2
Debt Security Commingled Vehicles [Member] | Carrying Amount |  |
Fair value measurements of plan assets [Abstract] |  |
Fair value | 129 | 184
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 |  |
Fair value measurements of plan assets [Abstract] |  |
Fair value | 129 | 184
Debt Security Commingled Vehicles [Member] | Level 3 |  |
Fair value measurements of plan assets [Abstract] |  |
Fair value | 0 | 0
Convertible securities [Member] |  |
Fair value measurements of plan assets [Abstract] |  |
Foreign investments | 28 | 21
Convertible securities [Member] | Carrying Amount |  |
Fair value measurements of plan assets [Abstract] |  |
Fair value | 281 | 255
Convertible securities [Member] | Level 1 | Carrying Amount |  |
Fair value measurements of plan assets [Abstract] |  |
Fair value | 19 | 8
Convertible securities [Member] | Level 2 | Carrying Amount |  |
Fair value measurements of plan assets [Abstract] |  |
Fair value | 262 | 247
Convertible securities [Member] | Level 3 | Carrying Amount |  |
Fair value measurements of plan assets [Abstract] |  |
Fair value | 0 | 0
Other Debt Obligations |  |
Fair value measurements of plan assets [Abstract] |  |
Foreign investments |  | 2
Other Debt Obligations | Carrying Amount |  |
Fair value measurements of plan assets [Abstract] |  |
Fair value |  | 8
Other Debt Obligations | Level 1 | Carrying Amount |  |
Fair value measurements of plan assets [Abstract] |  |
Fair value |  | 6
Other Debt Obligations | Level 2 | Carrying Amount |  |
Fair value measurements of plan assets [Abstract] |  |
Fair value |  | 2
Other Debt Obligations | Level 3 | Carrying Amount |  |
Fair value measurements of plan assets [Abstract] |  |
Fair value |  | 0
Total Investments |  |
Fair value measurements of plan assets [Abstract] |  |
Fair value | 5,121 | 4,897
Foreign investments | 274 | 240
Total Investments | Carrying Amount |  |
Fair value measurements of plan assets [Abstract] |  |
Fair value | 3,513 | 3,504
Total Investments | Level 1 | Carrying Amount |  |
Fair value measurements of plan assets [Abstract] |  |
Fair value | 1,533 | 1,554
Total Investments | Level 2 | Carrying Amount |  |
Fair value measurements of plan assets [Abstract] |  |
Fair value | 1,979 | 1,949
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 | $ 1,608 | $ 1,393

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