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Earnings Per Share Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		37 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019
Earnings Per Share [Abstract]
Target Achievement Percentage	100.00%
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	11.2	7.6
Stock Repurchases [Abstract]
Shares Repurchased and Retired During Period, Shares	1.2		35.5
Shares Repurchased and Retired During Period, Value	$ 20	$ 94	$ 896
Weighted Average Market Price of Shares Repurchased and Retired During Period	$ 17.21		$ 25.22

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Weighted Average Market Price of Stock Repurchased and Retired During Period.

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Stock Repurchases [Abstract]

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Target Achievement Percentage

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Number of shares that have been repurchased and retired during the period.

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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