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Debt (Long-term Debt) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Total current portion of long-term debt and short-term borrowings $ 4 $ 379
Total long-term debt 5,998 5,128
Less current portion of long-term debt 4 379
Long-term debt 5,994 4,749
Debentures, 1.5%, Due 2018 [Member]    
Debentures   $ 375
Interest rate on debt   1.50%
Debt maturity date   2018
Debentures, 6.625%, Due 2019 [Member]    
Debentures   $ 245
Interest rate on debt   6.625%
Debt maturity date   2019
Debentures, 4.25%, Due 2020 [Member]    
Debentures $ 291 $ 288
Interest rate on debt 4.25% 4.25%
Debt maturity date 2020 2020
Debentures, 8.875%, Due 2021 [Member]    
Debentures $ 65 $ 66
Interest rate on debt 8.875% 8.875%
Debt maturity date 2021 2021
Debentures, 2.90%, Due 2022 [Member]    
Debentures $ 373 $ 373
Interest rate on debt 2.90% 2.90%
Debt maturity date 2022 2022
Debentures, 3.70%, due 2023 [Member]    
Debentures $ 249 $ 249
Average rate 3.70% 3.70%
Debt maturity date 2023 2023
Medium-Term Notes, Average Rate 7.66%, Due Through 2023 [Member]    
Debentures $ 45 $ 45
Interest rate on debt 7.66% 7.66%
Debt maturity date 2023 2023
Debentures, 7.00%, Due 2024 [Member]    
Debentures $ 100 $ 99
Interest rate on debt 7.00% 7.00%
Debt maturity date 2024 2024
Yen-denominated Debentures, .698%, due 2024 [Member]    
Debentures $ 191 $ 185
Interest rate on debt 0.698% 0.698%
Debt maturity date 2024 2024
Yen-denominated Debentures, .722%, due 2025 [Member]    
Debentures $ 90  
Interest rate on debt 0.722%  
Debt maturity date 2025  
Yen-denominated Debentures, .992%, due 2027 [Member]    
Debentures $ 426 $ 414
Interest rate on debt 0.992% 0.992%
Debt maturity date 2027 2027
Yen-denominated Debentures, 1.043%, due 2028 [Member]    
Debentures $ 276  
Interest rate on debt 1.043%  
Debt maturity date 2028  
Debentures, 6.85%, Due 2029 [Member]    
Debentures $ 164 $ 166
Interest rate on debt 6.85% 6.85%
Debt maturity date 2029 2029
Debentures, 1.219%, due 2030 [Member]    
Debentures $ 226  
Interest rate on debt 1.219%  
Debt maturity date 2030  
Debentures, Callable, 7.25%, Due 2036 [Member]    
Debentures $ 248 $ 248
Interest rate on debt 7.25% 7.25%
Debt maturity date 2036 2036
Debentures, 4.70%, Due 2037 [Member]    
Debentures $ 295 $ 248
Average rate 4.70% 4.70%
Debt maturity date 2037 2037
Yen-denominated Debentures, 1.583%, due 2037 [Member]    
Debentures $ 91 $ 85
Interest rate on debt 1.583% 1.583%
Debt maturity date 2037 2037
Debentures, 5.75%, Due 2040 [Member]    
Debentures $ 395 $ 397
Interest rate on debt 5.75% 5.75%
Debt maturity date 2040 2040
Debentures, 4.75%, Due 2042 [Member]    
Debentures $ 496 $ 496
Interest rate on debt 4.75% 4.75%
Debt maturity date 2042 2042
Debentures, 5.35%, due 2048 [Member]    
Debentures $ 543  
Interest rate on debt 5.35%  
Debt maturity date 2048  
Debentures, 4.375%, due 2057 [Member]    
Debentures $ 742 $ 743
Interest rate on debt 4.375% 4.375%
Debt maturity date 2057 2057
Debentures, 5.85%, due 2068 [Member]    
Debentures $ 296  
Interest rate on debt 5.85%  
Debt maturity date 2068  
Other, Average Rate 5.08%, due through 2043 [Member]    
Debentures $ 396 $ 406
Interest rate on debt 5.08% 5.08%
Debt maturity date 2043 2043