Balance Sheet Offsetting (Details) - Foreign Exchange Contract [Member] - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Assets
Gross Amounts Recognized	$ 813	$ 574
Gross Amount Offset in the Consolidated Balance Sheet	0	0
Net Amounts Presented in the Consolidated Balance Sheet	813	574
Gross Amounts Not Offset in the Consolidated Balance Sheet - Financial Instruments	(126)	(131)
Gross Amounts Not Offset in the Consolidated Balance Sheet - Cash Collateral Received/Pledged	(607)	(432)
Net Amount	80	11
Liabilities
Gross Amounts Recognized	163	172
Gross Amount Offset in the Consolidated Balance Sheet	0	0
Net Amounts Presented in the Consolidated Balance Sheet	163	172
Gross Amounts Not Offset in the Consolidated Balance Sheet - Financial Instruments	(126)	(131)
Gross Amounts Not Offset in the Consolidated Balance Sheet - Cash Collateral Received/Pledged	(31)	(30)
Net Amount	$ 6	$ 11

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