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Financing arrangements (Long-term Borrowings) (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Carrying values of long-term borrowings |  |  |
Short-term loan | $ 0 | $ 605 |
Total carrying value of debt | 35,342 | 34,596 |
Less current portion | (1,152) | (4,403) |
Total noncurrent debt | $ 34,190 | $ 30,193 |
2.125% notes due 2017 (2.125% 2017 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note |  | 2.125% |
Carrying values of long-term borrowings |  |  |
Notes payable, noncurrent |  | $ 1,250 |
Floating rate notes due 2017 [Member] |  |  |
Carrying values of long-term borrowings |  |  |
Notes payable, noncurrent |  | $ 600 |
1.25% notes due 2017 (1.25% 2017 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note |  | 1.25% |
Carrying values of long-term borrowings |  |  |
Notes payable, noncurrent |  | $ 850 |
5.85% notes due 2017 (5.85% 2017 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note |  | 5.85% |
Carrying values of long-term borrowings |  |  |
Notes payable, noncurrent |  | $ 1,100 |
6.15% notes due 2018 (6.15% 2018 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 6.15% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
Carrying values of long-term borrowings |  |  |
Notes payable, noncurrent | $ 500 | 500 |
4.375% euro-denominated notes due 2018 (4.375% 2018 euro Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 4.375% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
Carrying values of long-term borrowings |  |  |
Notes payable, noncurrent | $ 653 | 577 |
5.70% notes due 2019 (5.70% 2019 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 5.70% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
Carrying values of long-term borrowings |  |  |
Notes payable, noncurrent | $ 1,000 | 1,000 |
1.90% notes due 2019 (1.90% 2019 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 1.90% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
Carrying values of long-term borrowings |  |  |
Notes payable, noncurrent | $ 700 |  |
Floating rate notes due 2019 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
Carrying values of long-term borrowings |  |  |
Notes payable, noncurrent | $ 550 | 250 |
2.20% notes due 2019 (2.20% 2019 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 2.20% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
Carrying values of long-term borrowings |  |  |
Notes payable, noncurrent | $ 1,400 | 1,400 |
2.125% euro-denominated notes due 2019 (2.125% 2019 euro Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 2.125% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
Carrying values of long-term borrowings |  |  |
Notes payable, noncurrent | $ 810 | 710 |
4.50% notes due 2020 (4.50% 2020 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 4.50% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
Carrying values of long-term borrowings |  |  |
Notes payable, noncurrent | $ 300 | 300 |
2.125% notes due 2020 (2.125% 2020 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 2.125% |  | 2.125%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
Carrying values of long-term borrowings |  |  |
Notes payable, noncurrent | $ 750 | 750 |
Floating Rate Notes Due 2020 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
Carrying values of long-term borrowings |  |  |
Notes payable, noncurrent | $ 300 |  |
2.20% notes due 2020 (2.20% 2020 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 2.20% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
Carrying values of long-term borrowings |  |  |
Notes payable, noncurrent | $ 700 |  |
3.45% notes due 2020 (3.45% 2020 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 3.45% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
Carrying values of long-term borrowings |  |  |
Notes payable, noncurrent | $ 900 | 900 |
4.10% notes due 2021 (4.10% 2021 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 4.10% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
Carrying values of long-term borrowings |  |  |
Notes payable, noncurrent | $ 1,000 | $ 1,000 |
1.85% notes due 2021 (1.85% 2021 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 1.85% | 1.85% |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
Carrying values of long-term borrowings |  |  |
Notes payable, noncurrent | $ 750 | $ 750 |
3.875% notes due 2021 (3.875% 2021 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 3.875% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
Carrying values of long-term borrowings |  |  |
Notes payable, noncurrent | $ 1,750 | $ 1,750 |
1.25% notes due 2022 (1.25% 2022 euro Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 1.25% | 1.25% |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
Carrying values of long-term borrowings |  |  |
Notes payable, noncurrent | $ 1,501 | $ 1,315 |
2.70% notes due 2022 (2.70% 2022 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 2.70% |  | 2.70%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
Carrying values of long-term borrowings |  |  |
Notes payable, noncurrent | $ 500 | 500 |
2.65% notes due 2022 (2.65% 2022 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 2.65% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
Carrying values of long-term borrowings |  |  |
Notes payable, noncurrent | $ 1,500 |  |
3.625% notes due 2022 (3.625% 2022 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 3.625% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
Carrying values of long-term borrowings |  |  |
Notes payable, noncurrent | $ 750 | $ 750 |
0.41% 2023 Swiss franc Bonds [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 0.41% | 0.41% |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
Carrying values of long-term borrowings |  |  |
Notes payable, noncurrent | $ 719 | $ 687 |
2.25% notes due 2023 (2.25% 2023 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 2.25% | 2.25% |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
Carrying values of long-term borrowings |  |  |
Notes payable, noncurrent | $ 750 | $ 750 |
3.625% notes due 2024 (3.625% 2024 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 3.625% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
Carrying values of long-term borrowings |  |  |
Notes payable, noncurrent | $ 1,400 | 1,400 |
3.125% notes due 2025 (3.125% 2025 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 3.125% |  | 3.125%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
Carrying values of long-term borrowings |  |  |
Notes payable, noncurrent | $ 1,000 | $ 1,000 |
2.00% 2026 euro Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 2.00% | 2.00% |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
Carrying values of long-term borrowings |  |  |
Notes payable, noncurrent | $ 901 | $ 789 |
2.60% notes due 2026 (2.60% 2026 notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 2.60% | 2.60% |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
Carrying values of long-term borrowings |  |  |
Notes payable, noncurrent | $ 1,250 | $ 1,250 |
5.50% pound-sterling-denominated notes due 2026 (5.50% 2026 pound sterling Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 5.50% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
Carrying values of long-term borrowings |  |  |
Notes payable, noncurrent | $ 642 | 586 |
3.20% notes due 2027 (3.20% 2027 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 3.20% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
Carrying values of long-term borrowings |  |  |
Notes payable, noncurrent | $ 1,000 |  |
4.00% pound-sterling-denominated notes due 2029 (4.00% 2029 pound sterling Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 4.00% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
Carrying values of long-term borrowings |  |  |
Notes payable, noncurrent | $ 946 | 864 |
6.375% notes due 2037 (6.375% 2037 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 6.375% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
Carrying values of long-term borrowings |  |  |
Notes payable, noncurrent | $ 552 | 552 |
6.90% notes due 2038 (6.90% 2038 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 6.90% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
Carrying values of long-term borrowings |  |  |
Notes payable, noncurrent | $ 291 | 291 |
6.40% notes due 2039 (6.40% 2039 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 6.40% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
Carrying values of long-term borrowings |  |  |
Notes payable, noncurrent | $ 466 | 466 |
5.75% notes due 2040 (5.75% 2040 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 5.75% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
Carrying values of long-term borrowings |  |  |
Notes payable, noncurrent | $ 412 | 412 |
4.95% notes due 2041 (4.95% 2041 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 4.95% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
Carrying values of long-term borrowings |  |  |
Notes payable, noncurrent | $ 600 | 600 |
5.15% notes due 2041 (5.15% 2041 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 5.15% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
Carrying values of long-term borrowings |  |  |
Notes payable, noncurrent | $ 974 | 974 |
5.65% notes due 2042 (5.65% 2042 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 5.65% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
Carrying values of long-term borrowings |  |  |
Notes payable, noncurrent | $ 487 | 487 |
5.375% notes due 2043 (5.375% 2043 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 5.375% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
Carrying values of long-term borrowings |  |  |
Notes payable, noncurrent | $ 261 | $ 261 |
4.40% notes due 2045 (4.40% 2045 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 4.40% | 4.40% | 4.40%
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
Carrying values of long-term borrowings |  |  |
Notes payable, noncurrent | $ 2,250 | $ 2,250 |
4.563% notes due 2048 (4.563% 2048 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 4.563% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
Effective interest rate on note | 6.30% |  |
Carrying values of long-term borrowings |  |  |
Notes payable, noncurrent | $ 1,415 | 1,415 |
4.663% notes due 2051 (4.663% 2051 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Stated contractual interest rate on note | 4.663% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
Effective interest rate on note | 5.60% |  |
Carrying values of long-term borrowings |  |  |
Notes payable, noncurrent | $ 3,541 | 3,541 |
Other notes due 2097 [Member] |  |  |
Carrying values of long-term borrowings |  |  |
Notes payable, noncurrent | 100 | 100 |
Debt Securities Payable [Member] |  |  |
Carrying values of long-term borrowings |  |  |
Unamortized bond discounts and issuance costs | $ 929 | $ 936 |
Minimum [Member] | Debt Securities Payable [Member] |  |  |
Carrying values of long-term borrowings |  |  |
Redemption period without payment of make whole amount | 1 month |  |
Maximum [Member] | Debt Securities Payable [Member] |  |  |
Carrying values of long-term borrowings |  |  |
Redemption period without payment of make whole amount | 6 months |  |

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