Retirement, Other Postretirement Benefits, And Defined Contribution Plans (Investments Held For Qualified Pension And Other Postretirement Plans Measured At Fair Value) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Qualified Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	$ 4,855,066		$ 4,450,790
Cash	314		280
Other pending transactions	7,359		8,081
Less: Other postretirement assets included in total investments	(34,954)		(29,914)
Total fair value of qualified pension assets	4,827,785		4,429,237
Qualified Pension Plans [Member] | Preferred [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	10,017		12,885
Qualified Pension Plans [Member] | Common Stock [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	717,782		915,996
Qualified Pension Plans [Member] | Common Collective Trusts [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	1,886,897		1,753,958
Qualified Pension Plans [Member] | 103-12 Investment Entities [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	259,995
Qualified Pension Plans [Member] | U.S. Government securities [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	400,299		333,633
Qualified Pension Plans [Member] | Corporate Debt Securities [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	548,788		464,652
Qualified Pension Plans [Member] | Registered Investment Companies [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	863,175		803,611
Qualified Pension Plans [Member] | Other [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	130,295		129,169
Qualified Pension Plans [Member] | Insurance Company General Account (Unallocated Contracts) [Member] | Other Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	37,818		36,886
Other Postretirement [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	562,508		539,163
Other pending transactions	165		773
Plus: Other postretirement assets included in the investments of the qualified pension trust	34,954		29,914
Total fair value of qualified pension assets	597,627		569,850		488,448
Other Postretirement [Member] | Common Collective Trusts [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	370,228		356,700
Other Postretirement [Member] | U.S. Government securities [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	81,924		84,279
Other Postretirement [Member] | Corporate Debt Securities [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	57,830		50,563
Other Postretirement [Member] | Registered Investment Companies [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	5,558		4,163
Other Postretirement [Member] | Other [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	46,968		43,458
Fair Value Inputs Level 1 [Member] | Qualified Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	1,014,476		1,420,424
Fair Value Inputs Level 1 [Member] | Qualified Pension Plans [Member] | Preferred [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	10,017	[1]	6,847	[1]
Fair Value Inputs Level 1 [Member] | Qualified Pension Plans [Member] | Common Stock [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	717,685	[1]	915,996	[1]
Fair Value Inputs Level 1 [Member] | Qualified Pension Plans [Member] | U.S. Government securities [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	240	[1]	180,718	[1]
Fair Value Inputs Level 1 [Member] | Qualified Pension Plans [Member] | Registered Investment Companies [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	286,534	[2]	316,863	[2]
Fair Value Inputs Level 1 [Member] | Other Postretirement [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	41,864		44,971
Fair Value Inputs Level 1 [Member] | Other Postretirement [Member] | U.S. Government securities [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	36,306	[1]	40,808	[1]
Fair Value Inputs Level 1 [Member] | Other Postretirement [Member] | Registered Investment Companies [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	5,558	[2]	4,163	[2]
Fair Value Inputs Level 2 [Member] | Qualified Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	3,840,590		3,030,366
Fair Value Inputs Level 2 [Member] | Qualified Pension Plans [Member] | Preferred [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	0	[3]	6,038	[3]
Fair Value Inputs Level 2 [Member] | Qualified Pension Plans [Member] | Common Collective Trusts [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	1,886,897	[4]	1,753,958	[4]
Fair Value Inputs Level 2 [Member] | Qualified Pension Plans [Member] | 103-12 Investment Entities [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	259,995	[5]
Fair Value Inputs Level 2 [Member] | Qualified Pension Plans [Member] | U.S. Government securities [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	400,059	[3]	152,915	[3]
Fair Value Inputs Level 2 [Member] | Qualified Pension Plans [Member] | Corporate Debt Securities [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	548,788	[3]	464,652	[3]
Fair Value Inputs Level 2 [Member] | Qualified Pension Plans [Member] | Registered Investment Companies [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	576,641	[6]	486,748	[6]
Fair Value Inputs Level 2 [Member] | Qualified Pension Plans [Member] | Other [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	130,295	[7]	129,169	[7]
Fair Value Inputs Level 2 [Member] | Qualified Pension Plans [Member] | Insurance Company General Account (Unallocated Contracts) [Member] | Other Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	37,818	[8]	36,886	[8]
Fair Value Inputs Level 2 [Member] | Other Postretirement [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	520,644		494,192
Fair Value Inputs Level 2 [Member] | Other Postretirement [Member] | Common Collective Trusts [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	370,228	[4]	356,700	[4]
Fair Value Inputs Level 2 [Member] | Other Postretirement [Member] | U.S. Government securities [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	45,618	[3]	43,471	[3]
Fair Value Inputs Level 2 [Member] | Other Postretirement [Member] | Corporate Debt Securities [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	57,830	[3]	50,563	[3]
Fair Value Inputs Level 2 [Member] | Other Postretirement [Member] | Other [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	$ 46,968	[7]	$ 43,458	[7]

[1] (b)Common stocks, certain preferred stocks, and certain fixed income debt securities (government) are stated at fair value determined by quoted market prices.

[2] (d)The registered investment company is a money market mutual fund with a stable net asset value of one dollar per share.

[3] (a)Certain preferred stocks and certain fixed income debt securities (corporate, government, and securitized) are stated at fair value as determined by broker quotes.

[4] (c)The common collective trusts hold investments in accordance with stated objectives. The investment strategy of the trusts is to capture the growth potential of equity markets by replicating the performance of a specified index. Net asset value per share of the common collective trusts estimate fair value.

[5] (h)103-12 investment entities hold investments in accordance with stated objectives. The investment strategy of the investment entities is to capture the growth potential of international equity markets by replicating the performance of a specified index. Net asset value per share of the 103-12 investment entities estimate fair value.

[6] (e)The registered investment company holds investments in domestic and international bond markets and estimates fair value using net asset value per share.

[7] (f)The other remaining assets are U.S. municipal and foreign government bonds stated at fair value as determined by broker quotes.

[8] (g)The unallocated insurance contract investments are recorded at contract value, which approximates fair value. The contract value represents contributions made under the contract, plus interest, less funds used to pay benefits and contract expenses, and less distributions to the master trust.