Certain Employee Benefit and Stock Based Compensation Plans (Net Periodic Pension and Postretirement Benefits Costs) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Qualified Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 26,000,000	$ 28,000,000	$ 77,000,000	$ 85,000,000
Interest cost	46,000,000	42,000,000	140,000,000	127,000,000
Expected return on plan assets	(72,000,000)	(72,000,000)	(216,000,000)	(216,000,000)
Amortization of prior service credit	(2,000,000)	(2,000,000)	(6,000,000)	(6,000,000)
Amortization of actuarial losses		22,000,000		65,000,000
Net periodic cost/(benefit)	(2,000,000)	18,000,000	(5,000,000)	55,000,000
Nonqualified Retirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost		1,000,000	2,000,000	3,000,000
Interest cost	3,000,000	3,000,000	9,000,000	9,000,000
Amortization of actuarial losses	1,000,000	2,000,000	3,000,000	6,000,000
Net periodic cost/(benefit)	4,000,000	6,000,000	14,000,000	18,000,000
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	2,000,000	1,000,000	4,000,000	4,000,000
Interest cost	4,000,000	3,000,000	12,000,000	11,000,000
Amortization of prior service credit	(1,000,000)		(1,000,000)	(2,000,000)
Net periodic cost/(benefit)	$ 5,000,000	$ 4,000,000	$ 15,000,000	$ 13,000,000