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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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Earnings Per Share Earnings Per Share - Basic and Diluted Table (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Earnings Per Share Disclosure [Line Items]
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS	$ 145	$ 457	$ 518	$ 473
Weighted Average Number of Shares Outstanding, Basic	659	653	658	653
Earnings Per Share, Basic	$ 0.22	$ 0.70	$ 0.79	$ 0.72
Dilutive Securities, Effect on Basic Earnings Per Share			593
Net Income (Loss) Attributable to Parent		500
Weighted Average Number of Shares Outstanding, Diluted	659	760	760	653
Earnings Per Share, Diluted	$ 0.22	$ 0.66	$ 0.78	$ 0.72
Convertible Debt Securities [Member] \| 5.75% Cumulative Convertible Preferred Stock [Member]
Earnings Per Share Disclosure [Line Items]
Dilutive Securities, Effect on Basic Earnings Per Share		21	43
Weighted Average Number Diluted Shares Outstanding Adjustment		56	59
Convertible Debt Securities [Member] \| 5.75% Cumulative Convertible Preferred Stock Series A [Member]
Earnings Per Share Disclosure [Line Items]
Dilutive Securities, Effect on Basic Earnings Per Share		16	32
Weighted Average Number Diluted Shares Outstanding Adjustment		40	42
Convertible Debt Securities [Member] \| 5.0% Cumulative Convertible Preferred Stock Series Two Thousand And Five B [Member]
Earnings Per Share Disclosure [Line Items]
Dilutive Securities, Effect on Basic Earnings Per Share		3
Weighted Average Number Diluted Shares Outstanding Adjustment		5
Convertible Debt Securities [Member] \| 4.50% Cumulative Convertible Preferred Stock [Member]
Earnings Per Share Disclosure [Line Items]
Dilutive Securities, Effect on Basic Earnings Per Share		3
Weighted Average Number Diluted Shares Outstanding Adjustment		6
Employee Stock Option [Member]
Earnings Per Share Disclosure [Line Items]
Weighted Average Number Diluted Shares Outstanding Adjustment			1
Net Income (Loss) Attributable to Parent			$ 0