Retirement Benefits (Net Periodic Pension Costs (Benefits) For The Regular Pension Plan) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]
Net periodic pension cost			$ 6
Regular Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	14
Interest cost	341	341	336
Expected return on plan assets	(389)	(377)	(380)
Amortization of unrecognized net loss	185	148	78
Net periodic pension cost	$ 137	$ 112	$ 48