Employee Benefit Plans - Contributions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer contributions	$ 102
Expected future employer contribution, next fiscal year	150
Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer contributions	81
Expected future employer contribution, next fiscal year	130
Retiree Health
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer contributions	21	$ 19
Expected future employer contribution, next fiscal year	20
U.S. | Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer contributions	53	24
Expected future employer contribution, next fiscal year	100
U.S. | Pension Plan | Tax Qualified
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer contributions	30
Expected future employer contribution, next fiscal year	80
Non-U.S. | Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer contributions	28	$ 81
Expected future employer contribution, next fiscal year	$ 30