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Pension and Other Postretirement Benefits (Schedule of Defined Benefit Plan Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value   $ 0  
Fixed income      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value $ 210 199  
Investment funds – global equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 57 202  
Investment funds – real estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value   68  
Hedge funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 282 251  
Investment funds – emerging markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 20 24  
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value 533 518 $ 576
Level 3 | Hedge funds      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value 113 189 207
Level 3 | Private equity      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value 103 147 215
Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Total assets in fair value hierarchy 3,701 4,135  
Fair Value 569 744  
Total investments at fair value 4,270 4,879  
Pension Plan | Fixed income      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 210 199  
Pension Plan | Investment funds – global equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 57 202  
Pension Plan | Investment funds – real estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value   68  
Pension Plan | Hedge funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 282 251  
Pension Plan | Investment funds – emerging markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 20 24  
Pension Plan | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value 978 1,247  
Pension Plan | Level 1 | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value 259 317  
Pension Plan | Level 1 | Global large cap equity      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value 27 34  
Pension Plan | Level 1 | U.S. large cap equity      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value 69 114  
Pension Plan | Level 1 | Global mid/small cap equity      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value   10  
Pension Plan | Level 1 | U.S. mid/small cap equity      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value 198 279  
Pension Plan | Level 1 | Mutual funds – global equity      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value 133 175  
Pension Plan | Level 1 | Mutual funds – U.S. equity      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value 188 225  
Pension Plan | Level 1 | Fixed income      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value 104 93  
Pension Plan | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value 2,190 2,370  
Pension Plan | Level 2 | Fixed income      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value 411 485  
Pension Plan | Level 2 | Government issued debt securities      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value 341 606  
Pension Plan | Level 2 | Corporate debt securities      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value 261 80  
Pension Plan | Level 2 | Asset backed securities      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value 2 9  
Pension Plan | Level 2 | Structured debt      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value 699 904  
Pension Plan | Level 2 | Insurance contracts      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value 105 18  
Pension Plan | Level 2 | Derivatives      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value 103 136  
Pension Plan | Level 2 | Investment funds – global equity      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value 268 132  
Pension Plan | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value 533 518  
Pension Plan | Level 3 | Investment funds – real estate      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value 290 158  
Pension Plan | Level 3 | Hedge funds      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value 113 189  
Pension Plan | Level 3 | Private equity      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value 103 147  
Pension Plan | Level 3 | Real estate – direct      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value 27 24  
Pension Plan | U.S. Plans      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value 1,012 1,220 1,156
Total assets in fair value hierarchy 879 1,100  
Fair Value 132 119  
Total investments at fair value 1,011 1,219  
Accrued income 1 1  
Pension Plan | U.S. Plans | Fixed income      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 98 76  
Pension Plan | U.S. Plans | Investment funds – global equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 14 19  
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 0  
Pension Plan | U.S. Plans | Investment funds – emerging markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 20 24  
Pension Plan | U.S. Plans | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value 707 835  
Pension Plan | U.S. Plans | Level 1 | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value 34 13  
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 66 82  
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 182 247  
Pension Plan | U.S. Plans | Level 1 | Mutual funds – global equity      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value 133 175  
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 188 225  
Pension Plan | U.S. Plans | Level 1 | Fixed income      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value 104 93  
Pension Plan | U.S. Plans | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value 49 138  
Pension Plan | U.S. Plans | Level 2 | Fixed income      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value 0 3  
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 50  
Pension Plan | U.S. Plans | Level 2 | Corporate debt securities      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value 49 76  
Pension Plan | U.S. Plans | Level 2 | Asset backed securities      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value 0 9  
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 123 127  
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 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 9 15  
Pension Plan | U.S. Plans | Level 3 | Real estate – direct      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value 20 18  
Pension Plan | Non-U.S. Plans      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value 3,264 3,665 $ 3,152
Total assets in fair value hierarchy 2,822 3,035  
Fair Value 437 625  
Total investments at fair value 3,259 3,660  
Accrued income 5 5  
Pension Plan | Non-U.S. Plans | Fixed income      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 112 123  
Pension Plan | Non-U.S. Plans | Investment funds – global equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 43 183  
Pension Plan | Non-U.S. Plans | Investment funds – real estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value   68  
Pension Plan | Non-U.S. Plans | Hedge funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value 282 251  
Pension Plan | Non-U.S. Plans | Investment funds – emerging markets      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value   0  
Fair Value 0    
Pension Plan | Non-U.S. Plans | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value 271 412  
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 225 304  
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 27 34  
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 3 32  
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  
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 16 32  
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 2,141 2,232  
Pension Plan | Non-U.S. Plans | Level 2 | Fixed income      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value 411 482  
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 341 556  
Pension Plan | Non-U.S. Plans | Level 2 | Corporate debt securities      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value 212 4  
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 0  
Pension Plan | Non-U.S. Plans | Level 2 | Structured debt      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value 699 904  
Pension Plan | Non-U.S. Plans | Level 2 | Insurance contracts      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value 105 18  
Pension Plan | Non-U.S. Plans | Level 2 | Derivatives      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value 103 136  
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 268 132  
Pension Plan | Non-U.S. Plans | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value 410 391  
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 196 64  
Pension Plan | Non-U.S. Plans | Level 3 | Hedge funds      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value 113 189  
Pension Plan | Non-U.S. Plans | Level 3 | Private equity      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value 94 132  
Pension Plan | Non-U.S. Plans | Level 3 | Real estate – direct      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets at fair value $ 7 $ 6