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Retirement Benefits Plans - Components of Pension Plans with Accumulated Benefit Obligation in Excess of Plan Assets (Details 3) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
United States pension liabilities [Member] |  |
Components of pension plans with an accumulated benefit obligation in excess of plan assets |  |
Projected benefit obligation | $ 3,376 | $ 3,557
Accumulated benefit obligation | 3,219 | 3,403
Fair value of plan assets | 2,470 | 2,581
Non-United States pension liabilities [Member] |  |
Components of pension plans with an accumulated benefit obligation in excess of plan assets |  |
Projected benefit obligation | 1,387 | 1,524
Accumulated benefit obligation | 1,328 | 1,446
Fair value of plan assets | $ 650 | $ 673

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