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Employee Benefits - Fair Value of Plan Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Fair value of defined benefit plans assets by asset class    
Fair value of plan assets $ 1,464 $ 2,231
Total    
Fair value of defined benefit plans assets by asset class    
Fair value of plan assets 1,171 1,572
Level 1    
Fair value of defined benefit plans assets by asset class    
Fair value of plan assets 11 12
Level 2    
Fair value of defined benefit plans assets by asset class    
Fair value of plan assets 1,126 1,516
Level 3    
Fair value of defined benefit plans assets by asset class    
Fair value of plan assets 34 44
Common collective trust funds measured at net asset value as a practical expedient    
Fair value of defined benefit plans assets by asset class    
Fair value of plan assets 293 659
Cash and short-term investments | Total    
Fair value of defined benefit plans assets by asset class    
Fair value of plan assets 5 6
Cash and short-term investments | Level 1    
Fair value of defined benefit plans assets by asset class    
Fair value of plan assets 5 6
Cash and short-term investments | Level 2    
Fair value of defined benefit plans assets by asset class    
Fair value of plan assets 0 0
Cash and short-term investments | Level 3    
Fair value of defined benefit plans assets by asset class    
Fair value of plan assets 0 0
U.S. indexes | Total    
Fair value of defined benefit plans assets by asset class    
Fair value of plan assets 6 6
U.S. indexes | Level 1    
Fair value of defined benefit plans assets by asset class    
Fair value of plan assets 6 6
U.S. indexes | Level 2    
Fair value of defined benefit plans assets by asset class    
Fair value of plan assets 0 0
U.S. indexes | Level 3    
Fair value of defined benefit plans assets by asset class    
Fair value of plan assets 0 0
Long duration strategy | Total    
Fair value of defined benefit plans assets by asset class    
Fair value of plan assets 1,007 1,376
Long duration strategy | Level 1    
Fair value of defined benefit plans assets by asset class    
Fair value of plan assets 0 0
Long duration strategy | Level 2    
Fair value of defined benefit plans assets by asset class    
Fair value of plan assets 1,007 1,376
Long duration strategy | Level 3    
Fair value of defined benefit plans assets by asset class    
Fair value of plan assets 0 0
Intermediate duration securities | Total    
Fair value of defined benefit plans assets by asset class    
Fair value of plan assets 38 59
Intermediate duration securities | Level 1    
Fair value of defined benefit plans assets by asset class    
Fair value of plan assets 0 0
Intermediate duration securities | Level 2    
Fair value of defined benefit plans assets by asset class    
Fair value of plan assets 38 59
Intermediate duration securities | Level 3    
Fair value of defined benefit plans assets by asset class    
Fair value of plan assets 0 0
Real Estate: U.K. | Total    
Fair value of defined benefit plans assets by asset class    
Fair value of plan assets 34 44
Real Estate: U.K. | Level 1    
Fair value of defined benefit plans assets by asset class    
Fair value of plan assets 0 0
Real Estate: U.K. | Level 2    
Fair value of defined benefit plans assets by asset class    
Fair value of plan assets 0 0
Real Estate: U.K. | Level 3    
Fair value of defined benefit plans assets by asset class    
Fair value of plan assets 34 44
Infrastructure: U.K. | Total    
Fair value of defined benefit plans assets by asset class    
Fair value of plan assets 81 81
Infrastructure: U.K. | Level 1    
Fair value of defined benefit plans assets by asset class    
Fair value of plan assets 0 0
Infrastructure: U.K. | Level 2    
Fair value of defined benefit plans assets by asset class    
Fair value of plan assets 81 81
Infrastructure: U.K. | Level 3    
Fair value of defined benefit plans assets by asset class    
Fair value of plan assets $ 0 $ 0