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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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- Definition

Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise of dilutive convertible securities excluding adjustments related to ESOP convertible preferred stock, stock options, and restrictive stock units.

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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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- Definition

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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- Definition

Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities, and addition from assumption of issuance of common shares for dilutive potential common shares; of income (loss) available to common shareholders.

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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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Earnings Per Share Earnings Per Share - Schedule of Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Reconciliation of Earnings Per Share [Line Items]
Net Income (Loss) Available to Common Stockholders, Basic	$ 470	$ (1,818)	$ 547	$ (2,929)
Weighted Average Number of Shares Outstanding, Basic	908	724	907	695
Earnings Per Share, Basic	$ 0.52	$ (2.51)	$ 0.60	$ (4.21)
Net Income (Loss) Available to Common Stockholders, Diluted	$ 529		$ 619
Weighted Average Number of Shares Outstanding, Diluted	1,114	724	1,053	695
Earnings Per Share, Diluted	$ 0.47	$ (2.51)	$ 0.59	$ (4.21)
5.5% Convertible Senior Notes Due 2026 [Member]
Reconciliation of Earnings Per Share [Line Items]
Dilutive Securities, Effect on Basic Earnings Per Share, Dilutive Convertible Securities	$ 36		$ 72
Weighted Average Number Diluted Shares Outstanding Adjustment	146		146
5.75% Cumulative Convertible Preferred Stock [Member]
Reconciliation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		58	31	58
Dilutive Securities, Effect on Basic Earnings Per Share, Dilutive Convertible Securities	$ 11
Weighted Average Number Diluted Shares Outstanding Adjustment	31
5.75% Cumulative Convertible Preferred Stock Series A [Member]
Reconciliation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		42	18	42
Dilutive Securities, Effect on Basic Earnings Per Share, Dilutive Convertible Securities	$ 7
Weighted Average Number Diluted Shares Outstanding Adjustment	18
5.0% Cumulative Convertible Preferred Stock Series 2005 B [Member]
Reconciliation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		6	5	6
Dilutive Securities, Effect on Basic Earnings Per Share, Dilutive Convertible Securities	$ 2
Weighted Average Number Diluted Shares Outstanding Adjustment	5
4.50% Cumulative Convertible Preferred Stock [Member]
Reconciliation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		6	6	6
Dilutive Securities, Effect on Basic Earnings Per Share, Dilutive Convertible Securities	$ 3
Weighted Average Number Diluted Shares Outstanding Adjustment	6
5.75% Cumulative Convertible Preferred Stock Exchanged [Member]
Reconciliation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount			1