Employee Benefit Plans Postemployment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Defined Benefit Plan Disclosure [Line Items]
Net benefit cost	$ 426	$ 2	$ 426	$ 1
Postemployment Benefit Plans Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Net service cost	4	3	8	7
Interest cost	1	2	2	4
Prior service cost (benefit)	(1)	(1)	(2)	(2)
Defined Benefit Plan Gross Periodic Benefit Cost	4	4	8	9
Severance Costs	(3)	0	(5)	0
Net benefit cost	1	$ 4	3	$ 9
Defined Benefit Plan, Contributions by Employer	9		20
Defined Benefit Plan Estimated Total Employer Contributions in Current Fiscal Year	$ 80		80
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year			$ 60