Annual report pursuant to Section 13 and 15(d)

Restructuring Expense (Details)

v3.8.0.1
Restructuring Expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]      
Restructuring expense $ 6 $ 61 $ 61
Share-based compensation 114 117 195
Accrued restructuring expense   6  
Restructuring expense [Member]      
Restructuring Cost and Reserve [Line Items]      
Share-based compensation $ 3 $ 47 $ 58