Retirement Benefits Plans Retirement Benefits Plans - Discount Rates (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Retirement Benefits Plans - Discount Rates [Line Items]
Discount Rates for Service and Interest Costs		4.00%
Scenario, Forecast [Member]
Retirement Benefits Plans - Discount Rates [Line Items]
Discount Rate Service Costs	4.30%
Discount Rate Interest Costs	3.30%
Service Cost Reduction	$ 3
Interest Cost Reduction	$ 42

Discount Rate Interest Costs - Discount rate used for interest costs.

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Discount Rate Service Costs - Discount rate used for service costs.

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Discount Rates for Service and Interest Costs - Discount rate for service and interest costs.

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Interest Cost Reduction - The estimated reduction of interest costs due to change in discount rate.

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[Line Items] for Retirement Benefits Plans - Discount Rates [Table] - Discount rates changes.

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Service Cost Reduction - The estimated reduction in service costs due to change in discount rate.

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