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Pension and Other Postretirement Benefits (Schedule of Defined Benefit Plan Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | $ 464 | $ 533 | $ 518
Level 3 | Hedge funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 43 | 113 | 189
Level 3 | Private equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 75 | 103 | 147
Fair Value Measured at Net Asset Value Per Share | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value |  | 193 | 210
Fair Value Measured at Net Asset Value Per Share | Investment funds – global equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value |  | 96 | 57
Fair Value Measured at Net Asset Value Per Share | Hedge funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value |  | 328 | 282
Fair Value Measured at Net Asset Value Per Share | Investment funds – emerging markets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value |  | 23 | 20
Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Excluding Accrued Income | 4,604 | 4,270 |
Pension Plan | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 1,041 | 978 |
Pension Plan | Level 1 | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 213 | 259 |
Pension Plan | Level 1 | Global large cap equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 7 | 27 |
Pension Plan | Level 1 | U.S. large cap equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 159 | 69 |
Pension Plan | Level 1 | U.S. mid/small cap equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 245 | 198 |
Pension Plan | Level 1 | Mutual funds – global equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 144 | 133 |
Pension Plan | Level 1 | Mutual funds – U.S. equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 206 | 188 |
Pension Plan | Level 1 | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 67 | 104 |
Pension Plan | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 2,459 | 2,190 |
Pension Plan | Level 2 | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 373 | 411 |
Pension Plan | Level 2 | Government issued debt securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 260 | 341 |
Pension Plan | Level 2 | Corporate debt securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 384 | 261 |
Pension Plan | Level 2 | Asset backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 2 | 2 |
Pension Plan | Level 2 | Structured debt |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 811 | 699 |
Pension Plan | Level 2 | Insurance contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 105 | 105 |
Pension Plan | Level 2 | Derivatives |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 194 | 103 |
Pension Plan | Level 2 | Investment funds – global equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 297 | 268 |
Pension Plan | Level 2 | Investment funds – emerging markets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 33 |  |
Pension Plan | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 464 | 533 |
Pension Plan | Level 3 | Investment funds – real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 316 | 290 |
Pension Plan | Level 3 | Hedge funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 43 | 113 |
Pension Plan | Level 3 | Private equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 75 | 103 |
Pension Plan | Level 3 | Real estate – direct |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 30 | 27 |
Pension Plan | Total assets in fair value hierarchy |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 3,964 | 3,701 |
Pension Plan | Fair Value Measured at Net Asset Value Per Share |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 640 | 569 |
Pension Plan | Fair Value Measured at Net Asset Value Per Share | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 193 | 210 |
Pension Plan | Fair Value Measured at Net Asset Value Per Share | Investment funds – global equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 96 | 57 |
Pension Plan | Fair Value Measured at Net Asset Value Per Share | Hedge funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 328 | 282 |
Pension Plan | Fair Value Measured at Net Asset Value Per Share | Investment funds – emerging markets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 23 | 20 |
Pension Plan | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value |  | 1,012 | 1,220
Defined Benefit Plan Fair Value Of Plan Assets Excluding Accrued Income | 1,130 | 1,011 |
Accrued income | 1 | 1 |
Pension Plan | U.S. Plans | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 813 | 707 |
Pension Plan | U.S. Plans | Level 1 | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 23 | 34 |
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 | 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 | 155 | 66 |
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 | 218 | 182 |
Pension Plan | U.S. Plans | Level 1 | Mutual funds – global equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 144 | 133 |
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 | 206 | 188 |
Pension Plan | U.S. Plans | Level 1 | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 67 | 104 |
Pension Plan | U.S. Plans | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 52 | 49 |
Pension Plan | U.S. Plans | Level 2 | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 0 | 0 |
Pension Plan | U.S. Plans | Level 2 | Government issued debt securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 0 | 0 |
Pension Plan | U.S. Plans | Level 2 | Corporate debt securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 52 | 49 |
Pension Plan | U.S. Plans | Level 2 | Asset backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 0 | 0 |
Pension Plan | U.S. Plans | Level 2 | Structured debt |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 0 | 0 |
Pension Plan | U.S. Plans | Level 2 | Insurance contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 0 | 0 |
Pension Plan | U.S. Plans | Level 2 | Derivatives |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 0 | 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 | 0 |
Pension Plan | U.S. Plans | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 122 | 123 |
Pension Plan | U.S. Plans | Level 3 | Investment funds – real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 96 | 94 |
Pension Plan | U.S. Plans | Level 3 | Hedge funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 0 | 0 |
Pension Plan | U.S. Plans | Level 3 | Private equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 5 | 9 |
Pension Plan | U.S. Plans | Level 3 | Real estate – direct |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 21 | 20 |
Pension Plan | U.S. Plans | Total assets in fair value hierarchy |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 987 | 879 |
Pension Plan | U.S. Plans | Fair Value Measured at Net Asset Value Per Share |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 143 | 132 |
Pension Plan | U.S. Plans | Fair Value Measured at Net Asset Value Per Share | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 102 | 98 |
Pension Plan | U.S. Plans | Fair Value Measured at Net Asset Value Per Share | Investment funds – global equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 18 | 14 |
Pension Plan | U.S. Plans | Fair Value Measured at Net Asset Value Per Share | Hedge funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 0 | 0 |
Pension Plan | U.S. Plans | Fair Value Measured at Net Asset Value Per Share | Investment funds – emerging markets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 23 | 20 |
Pension Plan | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 3,480 | 3,264 | $ 3,665
Defined Benefit Plan Fair Value Of Plan Assets Excluding Accrued Income | 3,474 | 3,259 |
Accrued income | 6 | 5 |
Pension Plan | Non-U.S. Plans | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 228 | 271 |
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 | 190 | 225 |
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 | 7 | 27 |
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 | 4 | 3 |
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 | 27 | 16 |
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 | 0 |
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 | 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 | 0 |
Pension Plan | Non-U.S. Plans | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 2,407 | 2,141 |
Pension Plan | Non-U.S. Plans | Level 2 | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 373 | 411 |
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 | 260 | 341 |
Pension Plan | Non-U.S. Plans | Level 2 | Corporate debt securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 332 | 212 |
Pension Plan | Non-U.S. Plans | Level 2 | Asset backed securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 2 | 2 |
Pension Plan | Non-U.S. Plans | Level 2 | Structured debt |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 811 | 699 |
Pension Plan | Non-U.S. Plans | Level 2 | Insurance contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 105 | 105 |
Pension Plan | Non-U.S. Plans | Level 2 | Derivatives |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 194 | 103 |
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 | 297 | 268 |
Pension Plan | Non-U.S. Plans | Level 2 | Investment funds – emerging markets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 33 |  |
Pension Plan | Non-U.S. Plans | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 342 | 410 |
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 | 220 | 196 |
Pension Plan | Non-U.S. Plans | Level 3 | Hedge funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 43 | 113 |
Pension Plan | Non-U.S. Plans | Level 3 | Private equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 70 | 94 |
Pension Plan | Non-U.S. Plans | Level 3 | Real estate – direct |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 9 | 7 |
Pension Plan | Non-U.S. Plans | Total assets in fair value hierarchy |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 2,977 | 2,822 |
Pension Plan | Non-U.S. Plans | Fair Value Measured at Net Asset Value Per Share |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 497 | 437 |
Pension Plan | Non-U.S. Plans | Fair Value Measured at Net Asset Value Per Share | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 91 | 112 |
Pension Plan | Non-U.S. Plans | Fair Value Measured at Net Asset Value Per Share | Investment funds – global equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 78 | 43 |
Pension Plan | Non-U.S. Plans | Fair Value Measured at Net Asset Value Per Share | Hedge funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | 328 | 282 |
Pension Plan | Non-U.S. Plans | Fair Value Measured at Net Asset Value Per Share | Investment funds – emerging markets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan assets at fair value | $ 0 | $ 0 |

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