Quarterly report pursuant to Section 13 or 15(d)

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

v3.7.0.1
Share-Based Compensation - Schedule of Share-Based Compensation (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total share-based compensation $ 32 $ 17
Capitalized share-based compensation (8) (1)
Total share-based compensation expense 24 16
Equity Awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total share-based compensation 5 13
Capitalized share-based compensation (1) (1)
Total share-based compensation expense 4 12
Liability Awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total share-based compensation 27 4
Capitalized share-based compensation (7) 0
Total share-based compensation expense $ 20 $ 4