Basis of Presentation Basis of Presentation (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Cost Of Products Sold [Member]
Floor Brokerage, Exchange and Clearance Fees	$ 17	$ 20	$ 32	$ 35
Selling, General and Administrative Expenses [Member]
Floor Brokerage, Exchange and Clearance Fees		$ (20)		$ (35)

The amount of expense during the period for floor brokerage fees paid to other broker-dealers to execute trades on their behalf, stock exchange fees, order flow fees, and clearance fees.

No definition available.

Name:	us-gaap_FloorBrokerageExchangeAndClearanceFees
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration