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, 2012		Dec. 31, 2011		Dec. 31, 2010
Qualified Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	$ 3,836,479		$ 3,411,193
Cash	571		75
Other pending transactions	4,594		(9,238)
Less: Other postretirement assets included in total investments	(8,784)		(2,114)
Total fair value of qualified pension assets	3,832,860		3,399,916
Qualified Pension Plans [Member] | Preferred [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	6,767		11,752
Qualified Pension Plans [Member] | Common Stock [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	787,132		1,010,491
Qualified Pension Plans [Member] | Common Collective Trusts [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	1,620,315		1,074,178
Qualified Pension Plans [Member] | U.S. Government securities [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	311,661		300,246
Qualified Pension Plans [Member] | Corporate Debt Securities [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	429,813		380,558
Qualified Pension Plans [Member] | Registered Investment Companies [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	533,538		497,598
Qualified Pension Plans [Member] | Other [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	111,001		101,674
Qualified Pension Plans [Member] | Insurance Company General Account (Unallocated Contracts) [Member] | Other Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	36,252		34,696
Other Postretirement [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	479,506		425,293
Other pending transactions	158		(235)
Plus: Other postretirement assets included in the investments of the qualified pension trust	8,784		2,114
Total fair value of qualified pension assets	488,448		427,172		404,430
Other Postretirement [Member] | Common Collective Trusts [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	314,478		208,812
Other Postretirement [Member] | U.S. Government securities [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	79,790		99,728
Other Postretirement [Member] | Corporate Debt Securities [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	42,163		42,807
Other Postretirement [Member] | Registered Investment Companies [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	3,229		4,659
Other Postretirement [Member] | Other [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	39,846		69,287
Fair Value Inputs Level 1 [Member] | Qualified Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	999,615		1,210,061
Fair Value Inputs Level 1 [Member] | Qualified Pension Plans [Member] | Preferred [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	861	[1]	3,738	[1]
Fair Value Inputs Level 1 [Member] | Qualified Pension Plans [Member] | Common Stock [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	787,132	[1]	1,010,491	[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	161,593	[1]	142,509	[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	50,029	[2]	53,323	[2]
Fair Value Inputs Level 1 [Member] | Other Postretirement [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	39,621		47,236
Fair Value Inputs Level 1 [Member] | Other Postretirement [Member] | U.S. Government securities [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	36,392	[1]	42,577	[1]
Fair Value Inputs Level 1 [Member] | Other Postretirement [Member] | Registered Investment Companies [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	3,229	[2]	4,659	[2]
Fair Value Inputs Level 2 [Member] | Qualified Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	2,836,864		2,201,132
Fair Value Inputs Level 2 [Member] | Qualified Pension Plans [Member] | Preferred [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	5,906	[3]	8,014	[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	1,620,315	[4]	1,074,178	[4]
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	150,068	[3]	157,737	[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	429,813	[3]	380,558	[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	483,509	[5]	444,275	[5]
Fair Value Inputs Level 2 [Member] | Qualified Pension Plans [Member] | Other [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	111,001	[6]	101,674	[6]
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	36,252	[7]	34,696	[7]
Fair Value Inputs Level 2 [Member] | Other Postretirement [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	439,885		378,057
Fair Value Inputs Level 2 [Member] | Other Postretirement [Member] | Common Collective Trusts [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	314,478	[4]	208,812	[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	43,398	[3]	57,151	[3]
Fair Value Inputs Level 2 [Member] | Other Postretirement [Member] | Corporate Debt Securities [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	42,163	[3]	42,807	[3]
Fair Value Inputs Level 2 [Member] | Other Postretirement [Member] | Other [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Investments	$ 39,846	[6]	$ 69,287	[6]

[1] Common stocks, treasury notes and bonds, and certain preferred stocks and fixed income debt securities are stated at fair value determined by quoted market prices.

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

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

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

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

[7] 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.