Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Earnings Per Share [Abstract]
Net Income (Loss) Attributable to Parent		$ 36	$ (287)
Weighted Average, Number of Shares Outstanding, Basic (in shares)	[1]	431	429
Weighted Average Number Diluted Shares Outstanding Adjustment	[2]	3	0
Weighted Average, Number of Shares Outstanding, Diluted (in shares)	[2]	434	429
Earnings (Loss) from Continuing Operations Per Share, Basic (in dollars per share)		$ 0.08	$ (0.67)
Earnings (Loss) from Continuing Operations Per Share, Diluted (in dollars per share)		$ 0.08	$ (0.67)
Number of antidilutive stock options, shares of restricted stock and shares of common stock in rabbi trust excluded from calculation above (in shares)		14	15

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[2] For first quarter 2016, all outstanding options and non-vested restricted shares have been excluded from the calculation of diluted loss per share as the Company incurred a net loss. Therefore, inclusion of outstanding options and non-vested restricted shares in the calculation of diluted loss per share would be anti-dilut