Quarterly report pursuant to Section 13 or 15(d)

Share-Based Compensation - Schedule of Share-Based Compensation (Details)

v3.10.0.1
Share-Based Compensation - Schedule of Share-Based Compensation (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total share-based compensation $ 37 $ 27 $ 71 $ 59
Capitalized share-based compensation (7) (5) (13) (13)
Total share-based compensation expense 30 22 58 46
Tax benefit associated with share-based compensation expense 0 2 2 2
Equity Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total share-based compensation 22 10 39 15
Liability Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total share-based compensation $ 15 $ 17 $ 32 $ 44