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Employee Retirement Benefits - Fair Value of Pension Plan Assets (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Value Measured at Net Asset Value Per Share |  |
Fair value measurements of plan assets [Abstract] |  |
Foreign investments | $ 242 | $ 220
Equity Securities [Member] |  |
Fair value measurements of plan assets [Abstract] |  |
Foreign investments | 526 | 927
Equity Securities [Member] | Carrying Amount |  |
Fair value measurements of plan assets [Abstract] |  |
Fair value | 1,252 | 2,008
Equity Securities [Member] | Level 1 | Carrying Amount |  |
Fair value measurements of plan assets [Abstract] |  |
Fair value | 1,246 | 1,977
Equity Securities [Member] | Level 2 | Carrying Amount |  |
Fair value measurements of plan assets [Abstract] |  |
Fair value | 5 | 29
Equity Securities [Member] | Level 3 | Carrying Amount |  |
Fair value measurements of plan assets [Abstract] |  |
Fair value | 1 | 2
Equity Commingled Vehicles [Member] |  |
Fair value measurements of plan assets [Abstract] |  |
Foreign investments | 191 | 169
Equity Commingled Vehicles [Member] | Carrying Amount |  |
Fair value measurements of plan assets [Abstract] |  |
Fair value | 731 | 889
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 | 731 | 889
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 | 90 | 137
U.S. Government And Municipal Bonds [Member] | Level 1 | Carrying Amount |  |
Fair value measurements of plan assets [Abstract] |  |
Fair value | 85 | 131
U.S. Government And Municipal Bonds [Member] | Level 2 | Carrying Amount |  |
Fair value measurements of plan assets [Abstract] |  |
Fair value | 5 | 6
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 | 83 | 109
Corporate debt securities [Member] | Carrying Amount |  |
Fair value measurements of plan assets [Abstract] |  |
Fair value | 272 | 351
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 | 272 | 351
Corporate debt securities [Member] | Level 3 | Carrying Amount |  |
Fair value measurements of plan assets [Abstract] |  |
Fair value | 0 | 0
Asset-backed securities [Member] | Carrying Amount |  |
Fair value measurements of plan assets [Abstract] |  |
Fair value | 413 | 386
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 | 413 | 386
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 | 129 |
Debt Security Commingled Vehicles [Member] | Carrying Amount |  |
Fair value measurements of plan assets [Abstract] |  |
Fair value | 130 | 219
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 | 130 | 219
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 | 30 | 5
Convertible securities [Member] | Carrying Amount |  |
Fair value measurements of plan assets [Abstract] |  |
Fair value | 417 | 580
Convertible securities [Member] | Level 1 | Carrying Amount |  |
Fair value measurements of plan assets [Abstract] |  |
Fair value | 50 | 91
Convertible securities [Member] | Level 2 | Carrying Amount |  |
Fair value measurements of plan assets [Abstract] |  |
Fair value | 367 | 489
Convertible securities [Member] | Level 3 | Carrying Amount |  |
Fair value measurements of plan assets [Abstract] |  |
Fair value | 0 | 0
Investments measured at net asset value [Member] |  |
Fair value measurements of plan assets [Abstract] |  |
Foreign investments |  | 41
Total Investments |  |
Fair value measurements of plan assets [Abstract] |  |
Fair value | 4,543 | 5,688
Total Investments | Carrying Amount |  |
Fair value measurements of plan assets [Abstract] |  |
Fair value | 3,305 | 4,570
Total Investments | Level 1 | Carrying Amount |  |
Fair value measurements of plan assets [Abstract] |  |
Fair value | 1,381 | 2,199
Total Investments | Level 2 | Carrying Amount |  |
Fair value measurements of plan assets [Abstract] |  |
Fair value | 1,923 | 2,369
Total Investments | Level 3 | Carrying Amount |  |
Fair value measurements of plan assets [Abstract] |  |
Fair value | 1 | 2
Total Investments | Fair Value Measured at Net Asset Value Per Share | Carrying Amount |  |
Fair value measurements of plan assets [Abstract] |  |
Fair value | $ 1,238 | $ 1,118

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