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Employee Benefits - Fair Value of Plan Assets and Liabilities (Details) - Combined Pension Plan - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 4,476	$ 4,715	$ 8,531	$ 10,546
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5	5	11
NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,192	2,259
Investment Grade Bonds | NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	105	99
High Yield Bonds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4	4	6
High Yield Bonds | NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	110	81
U.S. Stocks | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1	1	$ 5
U.S. Stocks | NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	51	79
Non-U.S. Stocks | NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	412	270
Multi-Asset Strategies | NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	27	24
Cash Equivalents and Short-term Investments | NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	318	293
Emerging Market Stocks | NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	10	15
Private Equity | NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	272	326
Private Debt | NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	421	438
Market Neutral Hedge Funds | NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	77	135
Directional Hedge Funds | NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	124	166
Real Estate | NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	265	333
Fair Value, Measurements, Recurring
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,476	4,715
Fair Value, Measurements, Recurring | NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,192	2,259
Fair Value, Measurements, Recurring | Total Excluding Investments Valued at NAV | Total
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,660	2,736
Fair Value, Measurements, Recurring | Total Excluding Investments Valued at NAV | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	728	883
Fair Value, Measurements, Recurring | Total Excluding Investments Valued at NAV | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,927	1,848
Fair Value, Measurements, Recurring | Total Excluding Investments Valued at NAV | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5	5
Fair Value, Measurements, Recurring | Investment Grade Bonds | Total
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,228	2,166
Fair Value, Measurements, Recurring | Investment Grade Bonds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	390	446
Fair Value, Measurements, Recurring | Investment Grade Bonds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,838	1,720
Fair Value, Measurements, Recurring | Investment Grade Bonds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Measurements, Recurring | High Yield Bonds | Total
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	36	52
Fair Value, Measurements, Recurring | High Yield Bonds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Measurements, Recurring | High Yield Bonds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	32	48
Fair Value, Measurements, Recurring | High Yield Bonds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4	4
Fair Value, Measurements, Recurring | Emerging Market Bonds | Total
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	114	127
Fair Value, Measurements, Recurring | Emerging Market Bonds | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	57	49
Fair Value, Measurements, Recurring | Emerging Market Bonds | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	57	78
Fair Value, Measurements, Recurring | Emerging Market Bonds | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Measurements, Recurring | U.S. Stocks | Total
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	248	215
Fair Value, Measurements, Recurring | U.S. Stocks | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	247	214
Fair Value, Measurements, Recurring | U.S. Stocks | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Measurements, Recurring | U.S. Stocks | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1	1
Fair Value, Measurements, Recurring | Non-U.S. Stocks | Total
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6	150
Fair Value, Measurements, Recurring | Non-U.S. Stocks | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6	149
Fair Value, Measurements, Recurring | Non-U.S. Stocks | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	1
Fair Value, Measurements, Recurring | Non-U.S. Stocks | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Measurements, Recurring | Multi-Asset Strategies | Total
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	28	25
Fair Value, Measurements, Recurring | Multi-Asset Strategies | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	28	25
Fair Value, Measurements, Recurring | Multi-Asset Strategies | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Measurements, Recurring | Multi-Asset Strategies | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Measurements, Recurring | Cash Equivalents and Short-term Investments | Total
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		1
Fair Value, Measurements, Recurring | Cash Equivalents and Short-term Investments | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
Fair Value, Measurements, Recurring | Cash Equivalents and Short-term Investments | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		1
Fair Value, Measurements, Recurring | Cash Equivalents and Short-term Investments | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
Fair Value, Measurements, Recurring | Repurchase Agreements & Other Obligations | Total
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	(375)	(269)
Fair Value, Measurements, Recurring | Repurchase Agreements & Other Obligations | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Measurements, Recurring | Repurchase Agreements & Other Obligations | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	(375)	(269)
Fair Value, Measurements, Recurring | Repurchase Agreements & Other Obligations | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value, Measurements, Recurring | Derivatives | Total
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	(1)	(11)
Fair Value, Measurements, Recurring | Derivatives | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	(1)	(1)
Fair Value, Measurements, Recurring | Derivatives | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	(10)
Fair Value, Measurements, Recurring | Derivatives | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0	$ 0

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