Employee Benefits - Funded Status of Pension Plans Recognized in Balance Sheets (Details) - Pension Plan - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Funded status	$ (60)	$ (95)
Net prepaid pension cost recognized consists of:
Noncurrent assets	106	81
Current liabilities	(14)	(14)
Noncurrent liabilities	(152)	(162)
Net prepaid pension cost recognized	$ (60)	$ (95)