Employee Benefit Plans (Schedule Of Fair Value Of Plan Assets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	$ 2,194	$ 2,341
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	796	962
Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	1,398	1,379
Common stock - U.S. companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	180	221
Common stock - U.S. companies [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	180	221
Common stock - International companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	6	2
Common stock - International companies [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	6	2
Equity mutual funds - Emerging markets [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	62	75
Equity mutual funds - Emerging markets [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	62	75
Equity mutual funds - International [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	91	111
Equity mutual funds - International [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	91	111
Equity mutual funds - Large cap U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	362	419
Equity mutual funds - Large cap U.S. [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	362	419
Common collective trust funds - International equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	370	373
Common collective trust funds - International equity [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	370	373
Common collective trust funds - Large cap U.S. equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	33	51
Common collective trust funds - Large cap U.S. equity [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	33	51
Common collective trust funds - Fixed income [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	500	437
Common collective trust funds - Fixed income [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	500	437
Common collective trust funds - Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	35	62
Common collective trust funds - Other [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	35	62
Debt instruments - Corporate bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	422	422
Debt instruments - Corporate bonds [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	422	422
Debt instruments - U.S. Treasury instruments [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	95	134
Debt instruments - U.S. Treasury instruments [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	95	134
Debt instruments - U.S. government agency, state and local government bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	37	32
Debt instruments - U.S. government agency, state and local government bonds [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	37	32
Other Debt Instruments [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	1	2
Other Debt Instruments [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	$ 1	$ 2