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Retirement Benefits - Fair Value Recurring Basis (Details) (USD $)
Sep. 30, 2012
Dec. 31, 2011
Fair Value Defined Benefit Plan Measured On Recurring Basis Financial Statement Captions [Line Items]    
Cash equivalents $ 1,117,000,000 $ 861,000,000 [1]
[1] Excludes certain cash equivalents considered to be held-to-maturity and not reported at fair value.