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Pension and Other Postretirement Benefits (Schedule of Defined Benefit Plan Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | $ 199 | $ 187 |
Investment funds – global equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | 202 | 269 |
Investment funds – real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | 68 | 57 |
Hedge funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | 251 | 186 |
Investment funds – emerging markets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | 24 | 23 |
Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 518 | 576 | $ 642
Level 3 | Hedge funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 189 | 207 | 225
Level 3 | Private equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 147 | 215 | 281
Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets in fair value hierarchy | 4,135 | 3,579 |
Fair Value | 744 | 722 |
Total investments at fair value | 4,879 | 4,301 |
Pension Plan | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | 199 | 187 |
Pension Plan | Investment funds – global equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | 202 | 269 |
Pension Plan | Investment funds – real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | 68 | 57 |
Pension Plan | Hedge funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | 251 | 186 |
Pension Plan | Investment funds – emerging markets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | 24 | 23 |
Pension Plan | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 1,247 | 902 |
Pension Plan | Level 1 | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 317 | 98 |
Pension Plan | Level 1 | Global large cap equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 34 | 14 |
Pension Plan | Level 1 | U.S. large cap equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 114 | 66 |
Pension Plan | Level 1 | Global mid/small cap equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 10 | 5 |
Pension Plan | Level 1 | U.S. mid/small cap equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 279 | 262 |
Pension Plan | Level 1 | Mutual funds – global equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 175 | 151 |
Pension Plan | Level 1 | Mutual funds – U.S. equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 225 | 214 |
Pension Plan | Level 1 | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 93 | 92 |
Pension Plan | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 2,370 | 2,101 |
Pension Plan | Level 2 | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 485 | 498 |
Pension Plan | Level 2 | Government issued debt securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 606 | 563 |
Pension Plan | Level 2 | Corporate debt securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 80 | 136 |
Pension Plan | Level 2 | Asset backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 9 | 13 |
Pension Plan | Level 2 | Structured debt |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 904 | 695 |
Pension Plan | Level 2 | Insurance contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 18 | 16 |
Pension Plan | Level 2 | Derivatives |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 136 | 98 |
Pension Plan | Level 2 | Investment funds – global equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 132 | 82 |
Pension Plan | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 518 | 576 |
Pension Plan | Level 3 | Investment funds – real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 158 | 132 |
Pension Plan | Level 3 | Hedge funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 189 | 207 |
Pension Plan | Level 3 | Private equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 147 | 215 |
Pension Plan | Level 3 | Real estate – direct |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 24 | 22 |
Pension Plan | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 1,220 | 1,156 | 1,190
Total assets in fair value hierarchy | 1,100 | 1,029 |
Fair Value | 119 | 126 |
Total investments at fair value | 1,219 | 1,155 |
Accrued income | 1 | 1 |
Pension Plan | U.S. Plans | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | 76 | 77 |
Pension Plan | U.S. Plans | Investment funds – global equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | 19 | 26 |
Pension Plan | U.S. Plans | Investment funds – real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | 0 |  |
Pension Plan | U.S. Plans | Hedge funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | 0 |  |
Pension Plan | U.S. Plans | Investment funds – emerging markets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | 24 | 23 |
Pension Plan | U.S. Plans | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 835 | 768 |
Pension Plan | U.S. Plans | Level 1 | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 13 | 15 |
Pension Plan | U.S. Plans | Level 1 | Global large cap equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 0 |  |
Pension Plan | U.S. Plans | Level 1 | U.S. large cap equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 82 | 60 |
Pension Plan | U.S. Plans | Level 1 | Global mid/small cap equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 0 |  |
Pension Plan | U.S. Plans | Level 1 | U.S. mid/small cap equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 247 | 238 |
Pension Plan | U.S. Plans | Level 1 | Mutual funds – global equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 175 | 149 |
Pension Plan | U.S. Plans | Level 1 | Mutual funds – U.S. equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 225 | 214 |
Pension Plan | U.S. Plans | Level 1 | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 93 | 92 |
Pension Plan | U.S. Plans | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 138 | 137 |
Pension Plan | U.S. Plans | Level 2 | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 3 | 2 |
Pension Plan | U.S. Plans | Level 2 | Government issued debt securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 50 | 49 |
Pension Plan | U.S. Plans | Level 2 | Corporate debt securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 76 | 75 |
Pension Plan | U.S. Plans | Level 2 | Asset backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 9 | 11 |
Pension Plan | U.S. Plans | Level 2 | Structured debt |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 0 |  |
Pension Plan | U.S. Plans | Level 2 | Insurance contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 0 |  |
Pension Plan | U.S. Plans | Level 2 | Derivatives |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 0 |  |
Pension Plan | U.S. Plans | Level 2 | Investment funds – global equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 0 |  |
Pension Plan | U.S. Plans | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 127 | 124 |
Pension Plan | U.S. Plans | Level 3 | Investment funds – real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 94 | 85 |
Pension Plan | U.S. Plans | Level 3 | Hedge funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 0 |  |
Pension Plan | U.S. Plans | Level 3 | Private equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 15 | 22 |
Pension Plan | U.S. Plans | Level 3 | Real estate – direct |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 18 | 17 |
Pension Plan | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 3,665 | 3,152 | $ 3,169
Total assets in fair value hierarchy | 3,035 | 2,550 |
Fair Value | 625 | 596 |
Total investments at fair value | 3,660 | 3,146 |
Accrued income | 5 | 6 |
Pension Plan | Non-U.S. Plans | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | 123 | 110 |
Pension Plan | Non-U.S. Plans | Investment funds – global equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | 183 | 243 |
Pension Plan | Non-U.S. Plans | Investment funds – real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | 68 | 57 |
Pension Plan | Non-U.S. Plans | Hedge funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | 251 | 186 |
Pension Plan | Non-U.S. Plans | Investment funds – emerging markets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value | 0 |  |
Pension Plan | Non-U.S. Plans | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 412 | 134 |
Pension Plan | Non-U.S. Plans | Level 1 | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 304 | 83 |
Pension Plan | Non-U.S. Plans | Level 1 | Global large cap equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 34 | 14 |
Pension Plan | Non-U.S. Plans | Level 1 | U.S. large cap equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 32 | 6 |
Pension Plan | Non-U.S. Plans | Level 1 | Global mid/small cap equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 10 | 5 |
Pension Plan | Non-U.S. Plans | Level 1 | U.S. mid/small cap equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 32 | 24 |
Pension Plan | Non-U.S. Plans | Level 1 | Mutual funds – global equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 0 | 2 |
Pension Plan | Non-U.S. Plans | Level 1 | Mutual funds – U.S. equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 0 |  |
Pension Plan | Non-U.S. Plans | Level 1 | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 0 |  |
Pension Plan | Non-U.S. Plans | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 2,232 | 1,964 |
Pension Plan | Non-U.S. Plans | Level 2 | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 482 | 496 |
Pension Plan | Non-U.S. Plans | Level 2 | Government issued debt securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 556 | 514 |
Pension Plan | Non-U.S. Plans | Level 2 | Corporate debt securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 4 | 61 |
Pension Plan | Non-U.S. Plans | Level 2 | Asset backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 0 | 2 |
Pension Plan | Non-U.S. Plans | Level 2 | Structured debt |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 904 | 695 |
Pension Plan | Non-U.S. Plans | Level 2 | Insurance contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 18 | 16 |
Pension Plan | Non-U.S. Plans | Level 2 | Derivatives |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 136 | 98 |
Pension Plan | Non-U.S. Plans | Level 2 | Investment funds – global equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 132 | 82 |
Pension Plan | Non-U.S. Plans | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 391 | 452 |
Pension Plan | Non-U.S. Plans | Level 3 | Investment funds – real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 64 | 47 |
Pension Plan | Non-U.S. Plans | Level 3 | Hedge funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 189 | 207 |
Pension Plan | Non-U.S. Plans | Level 3 | Private equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 132 | 193 |
Pension Plan | Non-U.S. Plans | Level 3 | Real estate – direct |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | $ 6 | $ 5 |

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