Pension and Postretirement Benefit Plans - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($)
Benefit Plan Information
Impact of remeasurement	$ 70
U.S. Pension Plans
Benefit Plan Information
Company contributions	$ 45
U.S. Pension Plans | United States
Benefit Plan Information
Discount rate	5.22%
Percentage increase (decrease) in discount rate obligation from the prior year	24.00%
U.S. Pension Plans | Minimum
Benefit Plan Information
Estimated pension contributions for current fiscal year	$ 100
U.S. Pension Plans | Maximum
Benefit Plan Information
Estimated pension contributions for current fiscal year	200
Postretirement Benefits
Benefit Plan Information
Company contributions	$ 3
Discount rate	5.19%
Percentage increase (decrease) in discount rate obligation from the prior year	25.00%