Balance Sheet Offsetting (Details) - Derivative Contract [Member] - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Assets
Gross Amounts Recognized	$ 492	$ 390
Gross Amount Offset in the Condensed Consolidated Balance Sheet	0	0
Net Amounts Presented in the Condensed Consolidated Balance Sheet	492	390
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Financial Instruments	(212)	(297)
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Cash Collateral Received/Pledged	(253)	(91)
Net Amount	27	2
Liabilities
Gross Amounts Recognized	249	419
Gross Amount Offset in the Condensed Consolidated Balance Sheet	0	0
Net Amounts Presented in the Condensed Consolidated Balance Sheet	249	419
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Financial Instruments	(212)	(297)
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Cash Collateral Received/Pledged	(1)	(59)
Net Amount	$ 36	$ 63

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