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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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+ References

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- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
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