Earnings Per Share Earnings Per Share - Reconciliation of Basic and Diluted EPS Table (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share Adjustments, Basic and Diluted [Line Items]
Net Income (Loss) Available to Common Stockholders, Basic	$ (3,782)	$ 374
Weighted Average Number of Shares Outstanding, Basic	661	658
Earnings Per Share, Basic	$ (5.72)us-gaap_EarningsPerShareBasic	$ 0.57us-gaap_EarningsPerShareBasic
Net Income (Loss) Available to Common Stockholders, Diluted		417
Weighted Average Number of Shares Outstanding, Diluted	661	765
Earnings Per Share, Diluted	$ (5.72)us-gaap_EarningsPerShareDiluted	$ 0.54us-gaap_EarningsPerShareDiluted
Convertible Debt Securities [Member] \| Employee Stock Option [Member]
Earnings Per Share Adjustments, Basic and Diluted [Line Items]
Dilutive Securities, Effect on Basic Earnings Per Share, Dilutive Convertible Securities		0
Weighted Average Number Diluted Shares Outstanding Adjustment		1
Convertible Debt Securities [Member] \| 5.75% Cumulative Convertible Preferred Stock [Member]
Earnings Per Share Adjustments, Basic and Diluted [Line Items]
Dilutive Securities, Effect on Basic Earnings Per Share, Dilutive Convertible Securities		21
Weighted Average Number Diluted Shares Outstanding Adjustment		56
Convertible Debt Securities [Member] \| 5.75% Cumulative Convertible Preferred Stock Series A [Member]
Earnings Per Share Adjustments, Basic and Diluted [Line Items]
Dilutive Securities, Effect on Basic Earnings Per Share, Dilutive Convertible Securities		16
Weighted Average Number Diluted Shares Outstanding Adjustment		39
Convertible Debt Securities [Member] \| 5.0% Cumulative Convertible Preferred Stock Series 2005 B [Member]
Earnings Per Share Adjustments, Basic and Diluted [Line Items]
Dilutive Securities, Effect on Basic Earnings Per Share, Dilutive Convertible Securities		3
Weighted Average Number Diluted Shares Outstanding Adjustment		5
Convertible Debt Securities [Member] \| 4.50% Cumulative Convertible Preferred Stock [Member]
Earnings Per Share Adjustments, Basic and Diluted [Line Items]
Dilutive Securities, Effect on Basic Earnings Per Share, Dilutive Convertible Securities		$ 3
Weighted Average Number Diluted Shares Outstanding Adjustment		6

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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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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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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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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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