Annual report pursuant to Section 13 and 15(d)

Consolidated Statements of Cash Flows (Parenthetical)

v2.4.0.6
Consolidated Statements of Cash Flows (Parenthetical) (USD $)
In Billions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2010
Supplemental Cash Flow Elements [Abstract]    
Other Significant Noncash Transaction, Value of Consideration Received $ 1.1 $ 1.0