Income per Share (Details) - shares shares in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted Average Number of Shares Outstanding, Basic	861	853	848
Weighted Average Number Diluted Shares Outstanding Adjustment	0	0	4
Weighted Average Number of Shares Outstanding, Diluted	861	853	852
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially Dilutive Securities During Period	11	10	2
Ordinarily Dilutive Shares	1	2	0
Antidilutive securities excluded from the computation of diluted income per share (shares)	12	12	2