Equity Method Investments and Related Party Transactions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Equity Method Investments Disclosure [Abstract]
Proceeds from Equity Method Investment, Distribution	$ 105	$ 270	$ 276
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	663	745
Equity Method Investment, Summarized Financial Information [Abstract]
Revenues and other income	832	1,269	1,294
Income from operations	250	588	631
Net income	187	459	508
Current assets	455	559
Noncurrent assets	1,049	931
Current liabilities	284	253
Noncurrent liabilities	183	87
Related Party Transactions [Abstract]
Revenue from Related Parties	42	48	60
Related Party Transaction, Purchases from Related Party		0	$ 132
Accounts Receivable, Related Parties, Current	28	25
Accounts Payable, Related Parties, Current	$ 11	15
EG Holdings [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	60.00%
Equity Method Investments	$ 310	402
Alba Plant LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	52.00%
Equity Method Investments	$ 163	167
AMPCO [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	45.00%
Equity Method Investments	$ 190	$ 176