Employee Retirement Benefits (Components Of Net Periodic Benefit Cost As Well As Other Changes In Plan Assets And Benefit Obligations Recognized In Other Comprehensive Income For Qualified Plan And SERP) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Compensation and Retirement Disclosure [Abstract]
Service cost	$ 13	$ 12	$ 11
Interest cost	13	14	14
Expected return on plan assets	(17)	(16)	(16)
Amortization of actuarial loss and prior service cost	9	8	4
Defined Benefit Plan, Other Costs	(2)	0	0
Net periodic benefit cost	20	18	13
Current year actuarial loss	(72)	20	30
Recognition of actuarial loss	10	6	4
Recognition of prior service cost	(1)	(1)	(1)
Total loss (gain) recognized in other comprehensive income	$ (83)	$ 13	$ 25