Organization and Summary of Significant Accounting Policies New Accounting Pronouncements (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
New Accounting Pronouncement, Early Adoption [Line Items]
Net Income	$ 154	$ 154	$ 156	$ 156	$ 249	$ 284
Earnings Per Share, Basic	$ 0.42		$ 0.44		$ 0.69	$ 0.79
Earnings Per Share, Diluted	$ 0.42		$ 0.43		$ 0.68	$ 0.79
Weighted Average Number of Shares Outstanding, Diluted	365,002		361,250		364,569	360,804
Accumulated deficit	$ (8,251)				$ (8,251)		$ (8,500)