Employee Benefit Plans - Projected vs. Accumulated Benefit Obligations in Excess of Plan Assets (Details) - U. S. Pension Plans - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, plans with benefit obligations in excess of plan assets, aggregate fair value of plan assets	$ 41	$ 101
Defined benefit plans with accumulated benefit obligations in excess of plan assets aggregate fair value of plan assets	41	101
Defined benefit plan pension plans with projected benefit obligations in excess of plan assets aggregate projected benefit obligation	113	171
Defined benefit plan pension plans with accumulated benefit obligations in excess of plan assets aggregate accumulated benefit obligation	0	0
Total accumulated benefit obligation for defined benefit pension plans	$ 86	$ 149