Employee Benefit Plans - Schedule of Amounts Recognized in the Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure
Noncurrent liabilities	$ (1,079)	$ (1,018)
Pension Benefits
Defined Benefit Plan Disclosure
Noncurrent assets	78	47
Current liabilities	(17)	(13)
Noncurrent liabilities	(508)	(429)
Net amount recognized	(447)	(395)
Other Postretirement Benefits
Defined Benefit Plan Disclosure
Noncurrent assets	0	0
Current liabilities	(11)	(19)
Noncurrent liabilities	(69)	(88)
Net amount recognized	$ (80)	$ (107)