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Derivative Financial Instruments - Summary of Potential Effect of Offsetting Derivatives (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Derivative Asset [Abstract]
Gross Amounts of Recognized Assets/Liabilities	$ 42	$ 13
Gross Amounts Offset on our Condensed Consolidated Balance Sheets	0	0
Amounts of Assets/Liabilities Presented on our Condensed Consolidated Balance Sheets	42	13
Derivative Financial Instruments	(6)	(8)
Cash Collateral Received/ Pledged	0	0
Net Amount (Legal Offset)	36	5
Derivative Liability [Abstract]
Gross Amounts of Recognized Assets/Liabilities	(6)	(93)
Gross Amounts Offset on our Condensed Consolidated Balance Sheets	0	0
Amounts of Assets/Liabilities Presented on our Condensed Consolidated Balance Sheets	(6)	(93)
Derivative Financial Instruments	6	8
Cash Collateral Received/ Pledged	0	0
Net Amount (Legal Offset)	$ 0	$ (85)

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