Employee Benefit Plans (Schedule Of Fair Value Of Plan Assets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	$ 2,341	$ 2,174
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	962	851
Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	1,379	1,323
Common stock - U.S. companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	221	182
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	221	182
Common stock - International companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	2	1
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	2	1
Equity mutual funds - Emerging markets [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	75	81
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	75	81
Equity mutual funds - International [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	111	110
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	111	110
Equity mutual funds - Large cap U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	419	386
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	419	386
Equity mutual funds - Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value		1
Equity mutual funds - Other [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value		1
Common collective trust funds - International equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	373	406
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	373	406
Common collective trust funds - Large cap U.S. equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	51	17
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	51	17
Common collective trust funds - Fixed income [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	437	373
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	437	373
Common collective trust funds - Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	62	47
Common collective trust funds - Other [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	62	47
Debt instruments - Corporate bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	422	437
Debt instruments - Corporate bonds [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	422	437
Debt instruments - U.S. Treasury instruments [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	134	90
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	134	90
Debt instruments - U.S. government agency, state and local government bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	32	39
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	32	39
Other Debt Instruments [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	2	4
Other Debt Instruments [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Total assets at fair value	$ 2	$ 4