Retirement Plans (Hypothetical Changes In The Discount Rate And Expected Long-Term Rate Of Return On Plan Assets) (Details) (Commercial Pension Plans, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Commercial Pension Plans
Increase (decrease) to net pension cost from:
Change in discount rate (increase 25 basis points)	$ (37)
Change in discount rate (decrease 25 basis points)	31
Change in discount rate of return on plan assets (increase of 25 basis points)	(16)
Change in long-term rate of return on plan assets (decrease 25 basis points)	$ 16