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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 |

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