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Earnings (Loss) Per Common Share Level 4 (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net Income (Loss) Attributable to Parent [Abstract]
Net Income (Loss) Attributable to Parent	$ 234	$ 438	$ 572	$ 977
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Weighted average common shares outstanding, basic	360.2	383.8	365.9	391.4
Dilutive effect of stock compensation plans	4.5	3.2	4.1	3.5
Dilutive effect of warrants	2.3	3.5	2.6	3.6
Weighted average common shares outstanding and dilutive potential common shares	367.0	390.5	372.6	398.5
Earnings Per Share, Basic and Diluted [Abstract]
Basic	$ 0.65	$ 1.14	$ 1.56	$ 2.50
Diluted	$ 0.64	$ 1.12	$ 1.54	$ 2.45

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- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method.

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