Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans (Details)

v3.6.0.2
Employee Benefit Plans (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Employee Benefit Plans [Abstract]      
Defined Contribution Plan, Cost Recognized $ 25 $ 27 $ 27