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Accounting Pronouncements Adoption of New Accounting Pronouncements (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2019
Accounting Standards Update 2016-02 - Forecast |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Operating Lease, Right-of-Use Assets |  |  | $ 2,000
Operating Lease, Liabilities |  |  | $ 2,000
Other Expense [Member] | Accounting Standards Update 2017-07 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | $ 33 | $ 26 |

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