Equity Investments (Schedule of Financial Information Related to Unconsolidated Entities Included in Consolidated Balance Sheets) (Details) $ in Millions	Dec. 31, 2016 USD ($)
Equity Investments [Abstract]
Current assets	$ 54
Noncurrent assets	112
Total assets	166
Current liabilities	17
Noncurrent liabilities	2
Members' equity	147
Total liabilities and equity	$ 166