XML 21 R121.htm IDEA: XBRL DOCUMENT

Financial Risk Management and Trading Activities - Fair Values for Corporation's Net Physical Derivative and Financial Assets and (Liabilities) (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Long-term debt, including current maturities	$ 5,987us-gaap_LongTermDebt	$ 5,798us-gaap_LongTermDebt

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References+ Details