Employee Benefit Plans (Estimated Amortized Net Periodic Benefit For 2012) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Unrecognized prior service cost	$ 19
Unrecognized net actuarial loss	4
Total	23
Pension Plans Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Unrecognized prior service cost	15
Unrecognized net actuarial loss	11
Total	$ 26