Retirement Plans (Amounts Deferred In AOCI On The Consolidated Balance Sheet) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Pension Benefits
Compensation And Retirement Disclosure Line Items
Defined Benefit Plan, Future Amortization of Prior Service Cost Credit	$ (67)
Defined Benefit Plan, Future Amortization of Loss	438
Other Postretirement Benefit Plans, Defined Benefit
Compensation And Retirement Disclosure Line Items
Defined Benefit Plan, Future Amortization of Prior Service Cost Credit	(5)
Defined Benefit Plan, Future Amortization of Loss	$ 6