XML 62 R51.htm IDEA: XBRL DOCUMENT v2.4.0.6
Supplemental Cash Flows Information (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Cash payments (receipts) for interest and taxes:    
Interest - net of amounts capitalized $ 394 $ 369
Tax refunds - net (243) (126)
Details of debt exchange:    
Pollution-control bonds redeemed 0 (86)
Pollution-control bonds issued 0 86
Dividends declared but not paid:    
Preferred and preference stock 6 12
Accrued capital expenditures $ 414 $ 362