Condensed Consolidated Statements of Comprehensive Income (Unaudited) (Parentheticals) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Reclassification of losses to net benefit cost, income tax	$ 2	$ 3	$ 3	$ 5
Reclassification of prior service credits to net benefit cost, income tax				(1)
Net derivative instrument gains (losses) arising during the period, income tax		1
Reclassification of realized derivative losses to net income, income tax	$ (1)		$ (1)	$ 1