Pension and Other Postretirement Benefits - Schedule of Fair Value of Pension Plan Assets (Details) - Pension benefits - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	$ 886	$ 925	$ 970
Securities purchased and sold but not yet settled
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	875	960
Equities:
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	563	436
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	431	310
Long/short equity hedge funds
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	20	18
Private equity
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	112	108
Fixed income
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	212	419
Intermediate and long duration government/credit
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	128	350
Other
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	84	69
Other investments:
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	100	105
Real estate
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	55	73
Discretionary and systematic macro hedge funds
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	40	29
Other
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	5	3
Securities purchased and sold but not yet settled, asset (liability)
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	11	(35)
Level 1 | Securities purchased and sold but not yet settled
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	90	205
Level 1 | Equities:
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	1	0
Level 1 | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	1	0
Level 1 | Long/short equity hedge funds
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	0	0
Level 1 | Private equity
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	0	0
Level 1 | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	89	205
Level 1 | Intermediate and long duration government/credit
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	71	199
Level 1 | Other
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	18	6
Level 1 | Other investments:
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	0	0
Level 1 | Real estate
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	0	0
Level 1 | Discretionary and systematic macro hedge funds
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	0	0
Level 1 | Other
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	0	0
Level 2 | Securities purchased and sold but not yet settled
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	254	304
Level 2 | Equities:
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	130	85
Level 2 | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	130	85
Level 2 | Long/short equity hedge funds
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	0	0
Level 2 | Private equity
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	0	0
Level 2 | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	123	214
Level 2 | Intermediate and long duration government/credit
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	57	151
Level 2 | Other
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	66	63
Level 2 | Other investments:
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	1	5
Level 2 | Real estate
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	1	5
Level 2 | Discretionary and systematic macro hedge funds
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	0	0
Level 2 | Other
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	0	0
Net Asset Value | Securities purchased and sold but not yet settled
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	531	451
Net Asset Value | Equities:
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	432	351
Net Asset Value | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	300	225
Net Asset Value | Long/short equity hedge funds
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	20	18
Net Asset Value | Private equity
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	112	108
Net Asset Value | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	0	0
Net Asset Value | Intermediate and long duration government/credit
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	0	0
Net Asset Value | Other
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	0	0
Net Asset Value | Other investments:
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	99	100
Net Asset Value | Real estate
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	54	68
Net Asset Value | Discretionary and systematic macro hedge funds
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	40	29
Net Asset Value | Other
Defined Benefit Plan Disclosure [Line Items]
Net plan assets	$ 5	$ 3