Basis of Presentation Basis of Presentation (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net Cash Provided by (Used in) Investing Activities	$ 2,180	$ 2,048
Cash Segregated under Commodity Exchange Act Regulation	900
Net Cash Provided by (Used in) Operating Activities	(3,574)	(1,489)
Restricted Cash and Cash Equivalents	944	1,464
Cash Flows Between Transferor and Transferee, Beneficial Interest	2,400	2,400
Other (Income) Expense - Net [Member]
Defined benefit plan net periodic benefit cost other than service cost	$ 3	9
Cost of Products Sold [Member]
Defined benefit plan net periodic benefit cost other than service cost		(4)
Selling, General and Administrative Expenses [Member]
Defined benefit plan net periodic benefit cost other than service cost		(5)
Restatement Adjustment [Member]
Net Cash Provided by (Used in) Operating Activities		531
Restricted Cash and Cash Equivalents		$ 1,400