Total Other Non-Operating Expense (Details) - USD ($) $ in Millions		12 Months Ended
	Jul. 02, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Schedule of Other Nonoperating Income (Expense) [Line Items]
Other Nonoperating Expense		$ (2)	$ 0	$ (128)
Entek
Schedule of Other Nonoperating Income (Expense) [Line Items]
Investment In Affiliate Ownership Percentage Sold				49.62%
Equity Method Investment, Purchase Price Agreement				$ 125
Equity Method Investment, Other than Temporary Impairment				86
Silver Ridge Power
Schedule of Other Nonoperating Income (Expense) [Line Items]
Equity Method Investment, Purchase Price Agreement	$ 179
Equity Method Investment, Other than Temporary Impairment				$ 42
Equity Method Investment, Ownership Percentage Sold	50.00%
Equity Method Investment, Net Sales Proceeds	$ 179