Retirement Plans (Amounts Recognized On The Consolidated Balance Sheet) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current liabilities	$ (309)	$ (303)
Noncurrent liabilities	(4,596)	(3,076)
Pension Benefits
Noncurrent assets	176	178
Current liabilities	(128)	(104)
Noncurrent liabilities	(4,200)	(2,611)
Net liability recognized	(4,152)	(2,537)
Other Postretirement Benefit Plans, Defined Benefit
Noncurrent assets	0	0
Current liabilities	(181)	(199)
Noncurrent liabilities	(396)	(465)
Net liability recognized	$ (577)	$ (664)