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Pension and Other Postemployment Benefits (Details 3) - Pension - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | $ 6,198 | $ 5,345 |
Asset Allocation | 100.00% | 100.00% |
Cash and short-term securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | $ 464 | $ 427 |
Asset Allocation | 8.00% | 8.00% |
Domestic |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | $ 1,061 | $ 944 |
Asset Allocation | 17.00% | 18.00% |
International |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | $ 1,691 | $ 1,189 |
Asset Allocation | 27.00% | 22.00% |
Government bonds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | $ 106 | $ 232 |
Asset Allocation | 2.00% | 4.00% |
Corporate bonds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | $ 1,245 | $ 1,115 |
Asset Allocation | 20.00% | 21.00% |
High yield debt |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | $ 372 | $ 438 |
Asset Allocation | 6.00% | 8.00% |
Mortgaged-backed securities (non-government) |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | $ 112 | $ 31 |
Asset Allocation | 2.00% | 1.00% |
Hedge funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | $ 500 | $ 343 |
Asset Allocation | 8.00% | 7.00% |
Derivatives |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | $ (1) | $ 15 |
Asset Allocation | 0.00% | 0.00% |
Private Equity Funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | $ 33 | $ 24 |
Asset Allocation | 0.00% | 0.00% |
Real Estate Funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | $ 615 | $ 587 |
Asset Allocation | 10.00% | 11.00% |
Level 1 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | $ 1,470 | $ 1,264 |
Level 1 | Cash and short-term securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | 0 | 0 |
Level 1 | Domestic |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | 1,048 | 869 |
Level 1 | International |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | 422 | 395 |
Level 1 | Government bonds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | 0 | 0 |
Level 1 | Corporate bonds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | 0 | 0 |
Level 1 | High yield debt |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | 0 | 0 |
Level 1 | Mortgaged-backed securities (non-government) |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | 0 | 0 |
Level 1 | Hedge funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | 0 | 0 |
Level 1 | Derivatives |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | 0 | 0 |
Level 1 | Private Equity Funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | 0 | 0 |
Level 1 | Real Estate Funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | 0 | 0 |
Level 2 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | 4,080 | 3,470 |
Level 2 | Cash and short-term securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | 464 | 427 |
Level 2 | Domestic |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | 13 | 75 |
Level 2 | International |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | 1,269 | 794 |
Level 2 | Government bonds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | 106 | 232 |
Level 2 | Corporate bonds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | 1,245 | 1,115 |
Level 2 | High yield debt |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | 372 | 438 |
Level 2 | Mortgaged-backed securities (non-government) |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | 112 | 31 |
Level 2 | Hedge funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | 500 | 343 |
Level 2 | Derivatives |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | (1) | 15 |
Level 2 | Private Equity Funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | 0 | 0 |
Level 2 | Real Estate Funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | 0 | 0 |
Level 3 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | 648 | 611 |
Level 3 | Cash and short-term securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | 0 | 0 |
Level 3 | Domestic |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | 0 | 0 |
Level 3 | International |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | 0 | 0 |
Level 3 | Government bonds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | 0 | 0 |
Level 3 | Corporate bonds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | 0 | 0 |
Level 3 | High yield debt |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | 0 | 0 |
Level 3 | Mortgaged-backed securities (non-government) |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | 0 | 0 |
Level 3 | Hedge funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | 0 | 0 |
Level 3 | Derivatives |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | 0 | 0 |
Level 3 | Private Equity Funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | 33 | 24 | $ 25
Level 3 | Real Estate Funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension investments measured at fair value | $ 615 | $ 587 | $ 421

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