Balance Sheet Offsetting (Details) - Derivative Contract [Member] - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Assets
Gross Amounts Recognized	$ 377	$ 220
Gross Amount Offset in the Condensed Consolidated Balance Sheet	0	0
Net Amounts Presented in the Condensed Consolidated Balance Sheet	377	220
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Financial Instruments	(318)	(124)
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Cash Collateral Received/Pledged	(48)	(80)
Net Amount	11	16
Liabilities
Gross Amounts Recognized	663	631
Gross Amount Offset in the Condensed Consolidated Balance Sheet	0	0
Net Amounts Presented in the Condensed Consolidated Balance Sheet	663	631
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Financial Instruments	(318)	(124)
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Cash Collateral Received/Pledged	(303)	(427)
Net Amount	$ 42	$ 80

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