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Pension Plans and Other Postretirement Benefits - Fair Value of Pension Plan Assets (Details) - Pension Plan - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 5,379	$ 5,346	$ 6,677
Total Fair Value, Inputs, Level 1, 2 and 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,352	4,299
Total Fair Value, Inputs, Level 1, 2 and 3 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	81	88
Total Fair Value, Inputs, Level 1, 2 and 3 | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,406	3,403
Total Fair Value, Inputs, Level 1, 2 and 3 | U.S. government securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	522	570
Total Fair Value, Inputs, Level 1, 2 and 3 | States, municipalities and political subdivisions
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	94	102
Total Fair Value, Inputs, Level 1, 2 and 3 | U.S. corporate securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,649	2,611
Total Fair Value, Inputs, Level 1, 2 and 3 | Foreign securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	106	101
Total Fair Value, Inputs, Level 1, 2 and 3 | Residential mortgage-backed securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	17	6
Total Fair Value, Inputs, Level 1, 2 and 3 | Commercial mortgage-backed securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9	1
Total Fair Value, Inputs, Level 1, 2 and 3 | Other asset-backed securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	8	11
Total Fair Value, Inputs, Level 1, 2 and 3 | Redeemable preferred securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1	1
Total Fair Value, Inputs, Level 1, 2 and 3 | Total equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	184	176
Total Fair Value, Inputs, Level 1, 2 and 3 | U.S. domestic
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	150	133
Total Fair Value, Inputs, Level 1, 2 and 3 | International
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	34	43
Total Fair Value, Inputs, Level 1, 2 and 3 | Other investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	681	632
Total Fair Value, Inputs, Level 1, 2 and 3 | Real estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	290	325
Total Fair Value, Inputs, Level 1, 2 and 3 | Common/collective trusts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	405	307
Total Fair Value, Inputs, Level 1, 2 and 3 | Derivatives
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	(14)
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	714	749
Level 1 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	12	7
Level 1 | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	518	566
Level 1 | U.S. government securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	518	566
Level 1 | States, municipalities and political subdivisions
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 1 | U.S. corporate securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 1 | Foreign securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 1 | Residential mortgage-backed securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 1 | Commercial mortgage-backed securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 1 | Other asset-backed securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 1 | Redeemable preferred securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 1 | Total equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	184	176
Level 1 | U.S. domestic
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	150	133
Level 1 | International
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	34	43
Level 1 | Other investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 1 | Real estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 1 | Common/collective trusts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 1 | Derivatives
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,348	3,225
Level 2 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	69	81
Level 2 | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,888	2,837
Level 2 | U.S. government securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4	4
Level 2 | States, municipalities and political subdivisions
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	94	102
Level 2 | U.S. corporate securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,649	2,611
Level 2 | Foreign securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	106	101
Level 2 | Residential mortgage-backed securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	17	6
Level 2 | Commercial mortgage-backed securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9	1
Level 2 | Other asset-backed securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	8	11
Level 2 | Redeemable preferred securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1	1
Level 2 | Total equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 2 | U.S. domestic
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 2 | International
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 2 | Other investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	391	307
Level 2 | Real estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 2 | Common/collective trusts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	405	307
Level 2 | Derivatives
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	(14)
Level 2 | Common/collective trusts, Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets, investment within plan asset category, amount	114	104
Level 2 | Common/collective trusts, Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Plan assets, investment within plan asset category, amount	291	203
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	290	325
Level 3 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | U.S. government securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | States, municipalities and political subdivisions
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | U.S. corporate securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | Foreign securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | Residential mortgage-backed securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | Commercial mortgage-backed securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | Other asset-backed securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | Redeemable preferred securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | Total equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | U.S. domestic
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | International
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | Other investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	290	325
Level 3 | Real estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	290	325	$ 378
Level 3 | Common/collective trusts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | Derivatives
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Fair Value Measured at Net Asset Value Per Share | Other receivables
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	314	390
Fair Value Measured at Net Asset Value Per Share | Private equity investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	461	432
Fair Value Measured at Net Asset Value Per Share | Hedge fund investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 252	$ 225

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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

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