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Consolidated Statements of Equity (Parentheticals) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Retained Earnings [Abstract]
Dividends declared on common stock (Per share)	$ 1.21	$ 0.90	$ 0.60
Noncontrolling Interest [Abstract]
Noncash capital contributions	$ 97	$ 0	$ 0

The value of the noncash (or part noncash) consideration received in a transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of a transaction not resulting in cash receipts or cash payments in the period.

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