Retirement Benefits Plans - Fair Value of Pension Plan Assets (Details 11) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Non-United States equity and global equities	$ 925	$ 965
United States equity	642	577
Fixed income	263	241
Long duration funds	107	91
Fixed income securities	296	230
United States treasuries	120	101
Real estate	82	81
Equity securities	79	78
Cash equivalents	67	77
Registered investment companies	35	32
Other	37	36
Total pension plan assets	2,653	2,509
United States pension plan percentage of worldwide pension assets	63.00%
United Kingdom pension plan percentage of worldwide pension assets	29.00%
United States pension plan target allocation of United States equities	35.00%
United States pension plan target allocation of non-United States equities	35.00%
United States pension plan target allocation of real estate	5.00%
United States target allocation of debt securities and other, including cash equivalents	25.00%
United Kingdom pension plan target allocation of equities	63.00%
Quoted prices in active markets for identical assets (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Non-United States equity and global equities	0	0
United States equity	0	0
Fixed income	0	0
Long duration funds	0	0
Fixed income securities	0	0
United States treasuries	120	101
Real estate	82	81
Equity securities	79	78
Cash equivalents	9	10
Registered investment companies	35	32
Other	2	2
Total pension plan assets	327	304
Other observable inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Non-United States equity and global equities	925	965
United States equity	642	577
Fixed income	263	241
Long duration funds	107	91
Fixed income securities	296	230
United States treasuries	0	0
Real estate	0	0
Equity securities	0	0
Cash equivalents	58	67
Registered investment companies	0	0
Other	0	0
Total pension plan assets	2,291	2,171
Unobservable inputs (Level 3) [Member]
Defined Benefit Plan Disclosure [Line Items]
Non-United States equity and global equities	0	0
United States equity	0	0
Fixed income	0	0
Long duration funds	0	0
Fixed income securities	0	0
United States treasuries	0	0
Real estate	0	0
Equity securities	0	0
Cash equivalents	0	0
Registered investment companies	0	0
Other	35	34
Total pension plan assets	$ 35	$ 34

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Defined Benefit Plan, Target Allocation Percentage of Assets, Debt Securities and Other: Target allocation percentage of investments in debt securities and other, including cash equivalents, to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

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Fair Value of Pension Plan Assets - Registered Investment Companies

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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 30

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Target allocation percentage of investments in real estate to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

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