Pension and Other Postretirement Benefit Plans (Fair Value of Plan Assets by Category) (Details) (USD $)	Dec. 31, 2011		Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Cash and Cash Equivalents	$ 1,000,000		$ 6,000,000
Mutual funds	340,000,000	[1]	414,000,000	[1]
Common and collective funds	52,000,000	[2]	34,000,000	[2]
Real estate	10,000,000	[3]	9,000,000	[3]
All other Investments	11,000,000		22,000,000
Fair Value of Plan Assets	2,743,000,000		2,460,000,000
Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Cash and Cash Equivalents	1,000,000		6,000,000
Common and collective funds		[2]		[2]
Real estate		[3]		[3]
All other Investments
Fair Value of Plan Assets	329,000,000		418,000,000
Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Cash and Cash Equivalents			0
Common and collective funds	52,000,000	[2]	34,000,000	[2]
Real estate	10,000,000	[3]	9,000,000	[3]
All other Investments	11,000,000		22,000,000
Fair Value of Plan Assets	2,221,000,000		1,868,000,000
Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Cash and Cash Equivalents	0		0
Common and collective funds		[2]		[2]
Real estate		[3]		[3]
All other Investments
Fair Value of Plan Assets	193,000,000		174,000,000
UNITED STATES [Member]
Defined Benefit Plan Disclosure [Line Items]
Government and government agency securities	432,000,000	[4]	394,000,000	[4]
Corporate bonds and notes	692,000,000	[4]	387,000,000	[4]
Equity securities	181,000,000		215,000,000
Common and collective funds	517,000,000	[2]	555,000,000	[2]
Limited partnerships	137,000,000	[5]	116,000,000	[5]
UNITED STATES [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Government and government agency securities		[4]		[4]
Corporate bonds and notes		[4]		[4]
Equity securities	181,000,000		215,000,000
Common and collective funds		[2]		[2]
Limited partnerships		[5]		[5]
UNITED STATES [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Government and government agency securities	432,000,000	[4]	394,000,000	[4]
Corporate bonds and notes	692,000,000	[4]	387,000,000	[4]
Equity securities
Common and collective funds	517,000,000	[2]	555,000,000	[2]
Limited partnerships		[5]		[5]
UNITED STATES [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Government and government agency securities		[4]		[4]
Corporate bonds and notes		[4]		[4]
Equity securities
Common and collective funds		[2]		[2]
Limited partnerships	137,000,000	[5]	116,000,000	[5]
Foreign Country [Member]
Defined Benefit Plan Disclosure [Line Items]
Government and government agency securities	50,000,000	[4]	17,000,000	[4]
Corporate bonds and notes	212,000,000	[4]	131,000,000	[4]
Equity securities	57,000,000		79,000,000
Common and collective funds	245,000,000	[2]	319,000,000	[2]
Foreign Country [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Government and government agency securities		[4]		[4]
Corporate bonds and notes		[4]		[4]
Equity securities	57,000,000		79,000,000
Common and collective funds		[2]		[2]
Foreign Country [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Government and government agency securities	50,000,000	[4]	17,000,000	[4]
Corporate bonds and notes	212,000,000	[4]	131,000,000	[4]
Equity securities
Common and collective funds	245,000,000	[2]	319,000,000	[2]
Foreign Country [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Government and government agency securities		[4]		[4]
Corporate bonds and notes		[4]		[4]
Equity securities
Common and collective funds		[2]		[2]
Money Market Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Mutual funds	90,000,000	[6]	118,000,000	[6]
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Mutual funds	90,000,000	[6]	118,000,000	[6]
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Mutual funds		[6]		[6]
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Mutual funds		[6]		[6]
Diversified fund of funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Limited partnerships	42,000,000	[5]	41,000,000	[5]
Diversified fund of funds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Limited partnerships		[5]		[5]
Diversified fund of funds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Limited partnerships		[5]		[5]
Diversified fund of funds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Limited partnerships	42,000,000	[5]	41,000,000	[5]
Emerging Growth [Member]
Defined Benefit Plan Disclosure [Line Items]
Limited partnerships	14,000,000	[5]	17,000,000	[5]
Emerging Growth [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Limited partnerships		[5]		[5]
Emerging Growth [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Limited partnerships		[5]		[5]
Emerging Growth [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Limited partnerships	$ 14,000,000	[5]	$ 17,000,000	[5]

[1] Money market funds are primarily comprised of United States government obligations.

[2] Valued using the NAV of the fund, which is based on the fair value of underlying securitie

[3] Valued using the NAV of the fund, which is based on the fair value of underlying securities

[4] Valued using pricing vendors who use proprietary models to estimate the price a dealer would pay to buy a security using significant observable inputs, such as interest rates, yield curves, and credit risk

[5] Valued at estimated fair value based on the proportionate share of the limited partnerships fair value, as determined by the general partne

[6] Valued using the net asset value (NAV) of the fund, which is based on the fair value of underlying securities. The fund primarily invests in a diversified portfolio of equity securities issued by non-U.S. companie