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Fair Value Measurements - Financial Liabilities not Measured at Fair Value (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Financial Liabilities    
Current Debt $ 1,773 $ 3,906
Non-Current Debt    
Non-Current Debt 29,480 $ 30,675
Carrying Amount    
Financial Liabilities    
Current Debt 1,773  
Non-Current Debt    
Non-Current Debt 29,480  
Estimated Fair Value    
Financial Liabilities    
Current Debt 1,773  
Non-Current Debt    
Non-Current Debt $ 29,938  
4.75% Notes due 2019 (1B Euro 1.1681)    
Non-Current Debt    
Stated interest rate (as a percent) 4.75%  
4.75% Notes due 2019 (1B Euro 1.1681) | Carrying Amount    
Non-Current Debt    
Non-Current Debt $ 1,166  
4.75% Notes due 2019 (1B Euro 1.1681) | Estimated Fair Value    
Non-Current Debt    
Non-Current Debt $ 1,231  
1.875% Notes due 2019    
Non-Current Debt    
Stated interest rate (as a percent) 1.875%  
1.875% Notes due 2019 | Carrying Amount    
Non-Current Debt    
Non-Current Debt $ 495  
1.875% Notes due 2019 | Estimated Fair Value    
Non-Current Debt    
Non-Current Debt $ 490  
3% Zero Coupon Convertible Subordinated Debentures due in 2020    
Non-Current Debt    
Stated interest rate (as a percent) 3.00%  
3% Zero Coupon Convertible Subordinated Debentures due in 2020 | Carrying Amount    
Non-Current Debt    
Non-Current Debt $ 52  
3% Zero Coupon Convertible Subordinated Debentures due in 2020 | Estimated Fair Value    
Non-Current Debt    
Non-Current Debt $ 100  
1.950% Notes due 2020    
Non-Current Debt    
Stated interest rate (as a percent) 1.95%  
1.950% Notes due 2020 | Carrying Amount    
Non-Current Debt    
Non-Current Debt $ 499  
1.950% Notes due 2020 | Estimated Fair Value    
Non-Current Debt    
Non-Current Debt $ 490  
2.95% Debentures due 2020    
Non-Current Debt    
Stated interest rate (as a percent) 2.95%  
2.95% Debentures due 2020 | Carrying Amount    
Non-Current Debt    
Non-Current Debt $ 548  
2.95% Debentures due 2020 | Estimated Fair Value    
Non-Current Debt    
Non-Current Debt $ 551  
3.55% Notes due 2021    
Non-Current Debt    
Stated interest rate (as a percent) 3.55%  
3.55% Notes due 2021 | Carrying Amount    
Non-Current Debt    
Non-Current Debt $ 448  
3.55% Notes due 2021 | Estimated Fair Value    
Non-Current Debt    
Non-Current Debt $ 454  
2.45% Notes due 2021    
Non-Current Debt    
Stated interest rate (as a percent) 2.45%  
2.45% Notes due 2021 | Carrying Amount    
Non-Current Debt    
Non-Current Debt $ 349  
2.45% Notes due 2021 | Estimated Fair Value    
Non-Current Debt    
Non-Current Debt $ 345  
1.65% Notes due 2021    
Non-Current Debt    
Stated interest rate (as a percent) 1.65%  
1.65% Notes due 2021 | Carrying Amount    
Non-Current Debt    
Non-Current Debt $ 998  
1.65% Notes due 2021 | Estimated Fair Value    
Non-Current Debt    
Non-Current Debt $ 967  
0.250% Notes due 2022 (1B Euro 1.1681)    
Non-Current Debt    
Stated interest rate (as a percent) 0.25%  
0.250% Notes due 2022 (1B Euro 1.1681) | Carrying Amount    
Non-Current Debt    
Non-Current Debt $ 1,165  
0.250% Notes due 2022 (1B Euro 1.1681) | Estimated Fair Value    
Non-Current Debt    
Non-Current Debt $ 1,172  
2.25% Notes due 2022    
Non-Current Debt    
Stated interest rate (as a percent) 2.25%  
2.25% Notes due 2022 | Carrying Amount    
Non-Current Debt    
Non-Current Debt $ 996  
2.25% Notes due 2022 | Estimated Fair Value    
Non-Current Debt    
Non-Current Debt $ 973  
6.73% Debentures due 2023    
Non-Current Debt    
Stated interest rate (as a percent) 6.73%  
6.73% Debentures due 2023 | Carrying Amount    
Non-Current Debt    
Non-Current Debt $ 250  
6.73% Debentures due 2023 | Estimated Fair Value    
Non-Current Debt    
Non-Current Debt $ 291  
3.375% Notes due 2023    
Non-Current Debt    
Stated interest rate (as a percent) 3.375%  
3.375% Notes due 2023 | Carrying Amount    
Non-Current Debt    
Non-Current Debt $ 805  
3.375% Notes due 2023 | Estimated Fair Value    
Non-Current Debt    
Non-Current Debt $ 829  
2.05% Notes due 2023    
Non-Current Debt    
Stated interest rate (as a percent) 2.05%  
2.05% Notes due 2023 | Carrying Amount    
Non-Current Debt    
Non-Current Debt $ 498  
2.05% Notes due 2023 | Estimated Fair Value    
Non-Current Debt    
Non-Current Debt $ 477  
0.650% Notes due 2024 (750MM Euro 1.1681)    
Non-Current Debt    
Stated interest rate (as a percent) 0.65%  
0.650% Notes due 2024 (750MM Euro 1.1681) | Carrying Amount    
Non-Current Debt    
Non-Current Debt $ 872  
0.650% Notes due 2024 (750MM Euro 1.1681) | Estimated Fair Value    
Non-Current Debt    
Non-Current Debt $ 881  
5.50% Notes due 2024 (500 MM GBP 1.3123)    
Non-Current Debt    
Stated interest rate (as a percent) 5.50%  
5.50% Notes due 2024 (500 MM GBP 1.3123) | Carrying Amount    
Non-Current Debt    
Non-Current Debt $ 651  
5.50% Notes due 2024 (500 MM GBP 1.3123) | Estimated Fair Value    
Non-Current Debt    
Non-Current Debt $ 793  
2.625% Notes due 2025    
Non-Current Debt    
Stated interest rate (as a percent) 2.625%  
2.625% Notes due 2025 | Carrying Amount    
Non-Current Debt    
Non-Current Debt $ 748  
2.625% Notes due 2025 | Estimated Fair Value    
Non-Current Debt    
Non-Current Debt $ 719  
2.45% Notes due 2026    
Non-Current Debt    
Stated interest rate (as a percent) 2.45%  
2.45% Notes due 2026 | Carrying Amount    
Non-Current Debt    
Non-Current Debt $ 1,991  
2.45% Notes due 2026 | Estimated Fair Value    
Non-Current Debt    
Non-Current Debt $ 1,884  
2.95% Notes due 2027    
Non-Current Debt    
Stated interest rate (as a percent) 2.95%  
2.95% Notes due 2027 | Carrying Amount    
Non-Current Debt    
Non-Current Debt $ 996  
2.95% Notes due 2027 | Estimated Fair Value    
Non-Current Debt    
Non-Current Debt $ 956  
2.90% Notes due 2028    
Non-Current Debt    
Stated interest rate (as a percent) 2.90%  
2.90% Notes due 2028 | Carrying Amount    
Non-Current Debt    
Non-Current Debt $ 1,493  
2.90% Notes due 2028 | Estimated Fair Value    
Non-Current Debt    
Non-Current Debt $ 1,420  
1.150% Notes due 2028 (750MM Euro 1.1681)    
Non-Current Debt    
Stated interest rate (as a percent) 1.15%  
1.150% Notes due 2028 (750MM Euro 1.1681) | Carrying Amount    
Non-Current Debt    
Non-Current Debt $ 868  
1.150% Notes due 2028 (750MM Euro 1.1681) | Estimated Fair Value    
Non-Current Debt    
Non-Current Debt $ 874  
6.95% Notes due 2029    
Non-Current Debt    
Stated interest rate (as a percent) 6.95%  
6.95% Notes due 2029 | Carrying Amount    
Non-Current Debt    
Non-Current Debt $ 296  
6.95% Notes due 2029 | Estimated Fair Value    
Non-Current Debt    
Non-Current Debt $ 385  
4.95% Debentures due 2033    
Non-Current Debt    
Stated interest rate (as a percent) 4.95%  
4.95% Debentures due 2033 | Carrying Amount    
Non-Current Debt    
Non-Current Debt $ 498  
4.95% Debentures due 2033 | Estimated Fair Value    
Non-Current Debt    
Non-Current Debt $ 559  
4.375% Notes due 2033    
Non-Current Debt    
Stated interest rate (as a percent) 4.375%  
4.375% Notes due 2033 | Carrying Amount    
Non-Current Debt    
Non-Current Debt $ 856  
4.375% Notes due 2033 | Estimated Fair Value    
Non-Current Debt    
Non-Current Debt $ 912  
1.650% Notes due 2035 (1.5B Euro 1.1681)    
Non-Current Debt    
Stated interest rate (as a percent) 1.65%  
1.650% Notes due 2035 (1.5B Euro 1.1681) | Carrying Amount    
Non-Current Debt    
Non-Current Debt $ 1,735  
1.650% Notes due 2035 (1.5B Euro 1.1681) | Estimated Fair Value    
Non-Current Debt    
Non-Current Debt $ 1,774  
3.55% Notes due 2036    
Non-Current Debt    
Stated interest rate (as a percent) 3.55%  
3.55% Notes due 2036 | Carrying Amount    
Non-Current Debt    
Non-Current Debt $ 988  
3.55% Notes due 2036 | Estimated Fair Value    
Non-Current Debt    
Non-Current Debt $ 945  
5.95% Notes due 2037    
Non-Current Debt    
Stated interest rate (as a percent) 5.95%  
5.95% Notes due 2037 | Carrying Amount    
Non-Current Debt    
Non-Current Debt $ 991  
5.95% Notes due 2037 | Estimated Fair Value    
Non-Current Debt    
Non-Current Debt $ 1,252  
3.625% Notes due 2037    
Non-Current Debt    
Stated interest rate (as a percent) 3.625%  
3.625% Notes due 2037 | Carrying Amount    
Non-Current Debt    
Non-Current Debt $ 1,486  
3.625% Notes due 2037 | Estimated Fair Value    
Non-Current Debt    
Non-Current Debt $ 1,433  
3.40% Notes due 2038    
Non-Current Debt    
Stated interest rate (as a percent) 3.40%  
3.40% Notes due 2038 | Carrying Amount    
Non-Current Debt    
Non-Current Debt $ 990  
3.40% Notes due 2038 | Estimated Fair Value    
Non-Current Debt    
Non-Current Debt $ 926  
5.85% Debentures due 2038    
Non-Current Debt    
Stated interest rate (as a percent) 5.85%  
5.85% Debentures due 2038 | Carrying Amount    
Non-Current Debt    
Non-Current Debt $ 696  
5.85% Debentures due 2038 | Estimated Fair Value    
Non-Current Debt    
Non-Current Debt $ 874  
4.50% Debentures due 2040    
Non-Current Debt    
Stated interest rate (as a percent) 4.50%  
4.50% Debentures due 2040 | Carrying Amount    
Non-Current Debt    
Non-Current Debt $ 538  
4.50% Debentures due 2040 | Estimated Fair Value    
Non-Current Debt    
Non-Current Debt $ 573  
4.85% Notes due 2041    
Non-Current Debt    
Stated interest rate (as a percent) 4.85%  
4.85% Notes due 2041 | Carrying Amount    
Non-Current Debt    
Non-Current Debt $ 297  
4.85% Notes due 2041 | Estimated Fair Value    
Non-Current Debt    
Non-Current Debt $ 330  
4.50% Notes due 2043    
Non-Current Debt    
Stated interest rate (as a percent) 4.50%  
4.50% Notes due 2043 | Carrying Amount    
Non-Current Debt    
Non-Current Debt $ 495  
4.50% Notes due 2043 | Estimated Fair Value    
Non-Current Debt    
Non-Current Debt $ 532  
3.70% Notes due 2046    
Non-Current Debt    
Stated interest rate (as a percent) 3.70%  
3.70% Notes due 2046 | Carrying Amount    
Non-Current Debt    
Non-Current Debt $ 1,971  
3.70% Notes due 2046 | Estimated Fair Value    
Non-Current Debt    
Non-Current Debt $ 1,884  
3.75% Notes due 2047    
Non-Current Debt    
Stated interest rate (as a percent) 3.75%  
3.75% Notes due 2047 | Carrying Amount    
Non-Current Debt    
Non-Current Debt $ 991  
3.75% Notes due 2047 | Estimated Fair Value    
Non-Current Debt    
Non-Current Debt $ 951  
3.50% Notes due 2048    
Non-Current Debt    
Stated interest rate (as a percent) 3.50%  
3.50% Notes due 2048 | Carrying Amount    
Non-Current Debt    
Non-Current Debt $ 742  
3.50% Notes due 2048 | Estimated Fair Value    
Non-Current Debt    
Non-Current Debt 689  
Other | Carrying Amount    
Non-Current Debt    
Non-Current Debt 22  
Other | Estimated Fair Value    
Non-Current Debt    
Non-Current Debt $ 22