Employee Benefit Plans - Defined Benefit Plans Measured Using Significant Unobservable Inputs Level 3 (Details) - Pension Plan - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of plan assets - beginning	$ 6,112
Fair value of plan assets - ending	6,190	$ 6,112
U.S.
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of plan assets - beginning	1,518	2,544
Fair value of plan assets - ending	1,528	1,518
U.S. | Real estate
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of plan assets - beginning	70
Fair value of plan assets - ending	59	70
U.S. | Private equity/venture capital
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of plan assets - beginning	202
Fair value of plan assets - ending	157	202
U.S. | Guaranteed Insurance Contracts
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of plan assets - beginning	0
Fair value of plan assets - ending	0	0
U.S. | Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of plan assets - beginning	57
Fair value of plan assets - ending	47	57
U.S. | Level 3 | Real estate
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of plan assets - beginning	57	51
Purchases	0	0
Sales	(13)	(2)
Unrealized gains (losses)	3	8
Currency translation	0	0
Fair value of plan assets - ending	47	57
U.S. | Level 3 | Private equity/venture capital
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of plan assets - beginning	0
Fair value of plan assets - ending	0	0
U.S. | Level 3 | Guaranteed Insurance Contracts
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of plan assets - beginning	0
Fair value of plan assets - ending	0	0
Non-U.S.
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of plan assets - beginning	4,594	7,252
Fair value of plan assets - ending	4,662	4,594
Non-U.S. | Real estate
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of plan assets - beginning	215
Fair value of plan assets - ending	176	215
Non-U.S. | Private equity/venture capital
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of plan assets - beginning	1,093
Fair value of plan assets - ending	315	1,093
Non-U.S. | Guaranteed Insurance Contracts
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of plan assets - beginning	483
Fair value of plan assets - ending	2,481	483
Non-U.S. | Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of plan assets - beginning	631	243
Purchases	1,951	569
Sales	(19)	(24)
Unrealized gains (losses)	(40)	(142)
Currency translation	68	(15)
Fair value of plan assets - ending	2,591	631
Non-U.S. | Level 3 | Real estate
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of plan assets - beginning	144	164
Purchases	0	0
Sales	(16)	(19)
Unrealized gains (losses)	(31)	(10)
Currency translation	9	9
Fair value of plan assets - ending	106	144
Non-U.S. | Level 3 | Private equity/venture capital
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of plan assets - beginning	4	4
Purchases	0	0
Sales	0	0
Unrealized gains (losses)	0	1
Currency translation	0	(1)
Fair value of plan assets - ending	4	4
Non-U.S. | Level 3 | Guaranteed Insurance Contracts
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of plan assets - beginning	483	75
Purchases	1,951	569
Sales	(3)	(5)
Unrealized gains (losses)	(9)	(133)
Currency translation	59	(23)
Fair value of plan assets - ending	$ 2,481	$ 483