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Benefit Plans (Estimated Net Loss and Prior Service Cost (Credit) Expected to be Amortized in 2017) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2016 USD ($)
Pension [Member] |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Estimated future net loss | $ 200
Estimated future prior service cost (credit) | 4
Postretirement Benefit Plan [Member] |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Estimated future net loss | 32
Estimated future prior service cost (credit) | $ (38)

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- Definition Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position. + References No definition available. + Details
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- Definition Amount included in accumulated other comprehensive income (AOCI) related to prior service cost (credit) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position. + References No definition available. + Details
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