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Financing arrangements (Principal Amounts and Carrying Value of Long-term Borrowings) (Details) - USD ($) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2017 | May 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |
Commercial paper | $ 1,500 |  | $ 0
Short-term loan | 0 |  | 605
Total carrying value of debt | 35,776 |  | 34,596
Less current portion | (1,999) |  | (4,403)
Total noncurrent debt | $ 33,777 |  | 30,193
2.125% notes due 2017 (2.125% 2017 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notes Payable, Noncurrent |  |  | $ 1,250
Interest rate, stated percentage | 2.125% |  | 2.125%
Floating Rate Notes due 2017 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notes Payable, Noncurrent |  |  | $ 600
1.25% notes due 2017 (1.25% 2017 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notes Payable, Noncurrent |  |  | $ 850
Interest rate, stated percentage | 1.25% |  | 1.25%
5.85% notes due 2017 (5.85% 2017 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notes Payable, Noncurrent |  |  | $ 1,100
Interest rate, stated percentage | 5.85% |  | 5.85%
6.15% notes due 2018 (6.15% 2018 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notes Payable, Noncurrent | $ 500 |  | $ 500
Interest rate, stated percentage | 6.15% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
4.375% €550 million notes due 2018 (4.375% 2018 euro Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notes Payable, Noncurrent | $ 647 |  | 577
Interest rate, stated percentage | 4.375% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
5.70% notes due 2019 (5.70% 2019 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notes Payable, Noncurrent | $ 1,000 |  | 1,000
Interest rate, stated percentage | 5.70% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
1.90% notes due 2019 (1.90% 2019 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notes Payable, Noncurrent | $ 700 |  |
Interest rate, stated percentage | 1.90% | 1.90% |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
Floating Rate Notes due 2019 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notes Payable, Noncurrent | $ 550 |  | 250
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
2.20% notes due 2019 (2.20% 2019 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notes Payable, Noncurrent | $ 1,400 |  | 1,400
Interest rate, stated percentage | 2.20% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
2.125% Euro Notes Due 2019 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notes Payable, Noncurrent | $ 797 |  | 710
Interest rate, stated percentage | 2.125% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
4.50% notes due 2020 (4.50% 2020 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notes Payable, Noncurrent | $ 300 |  | 300
Interest rate, stated percentage | 4.50% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
2.125% notes due 2020 (2.125% 2020 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notes Payable, Noncurrent | $ 750 |  | 750
Interest rate, stated percentage | 2.125% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
Floating Rate Notes Due 2020 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notes Payable, Noncurrent | $ 300 |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
2.20% notes due 2020 (2.20% 2020 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notes Payable, Noncurrent | $ 700 |  |
Interest rate, stated percentage | 2.20% | 2.20% |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
3.45% notes due 2020 (3.45% 2020 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notes Payable, Noncurrent | $ 900 |  | 900
Interest rate, stated percentage | 3.45% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
4.10% notes due 2021 (4.10% 2021 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notes Payable, Noncurrent | $ 1,000 |  | 1,000
Interest rate, stated percentage | 4.10% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
1.85% notes due 2021 (1.85% 2021 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notes Payable, Noncurrent | $ 750 |  | 750
Interest rate, stated percentage | 1.85% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
3.875% notes due 2021 (3.875% 2021 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notes Payable, Noncurrent | $ 1,750 |  | 1,750
Interest rate, stated percentage | 3.875% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
1.25% €1,250 million notes due 2022 (1.25% 2022 euro Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notes Payable, Noncurrent | $ 1,478 |  | 1,315
Interest rate, stated percentage | 1.25% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
2.70% notes due 2022 (2.70% 2022 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notes Payable, Noncurrent | $ 500 |  | 500
Interest rate, stated percentage | 2.70% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
2.65% notes due 2022 (2.65% 2022 Notes) {Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notes Payable, Noncurrent | $ 1,500 |  |
Interest rate, stated percentage | 2.65% | 2.65% |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
3.625% notes due 2022 (3.625% 2022 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notes Payable, Noncurrent | $ 750 |  | 750
Interest rate, stated percentage | 3.625% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
0.41% Swiss-franc-denominated bonds due 2023 (0.41% 2023 Swiss franc Bonds) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notes Payable, Noncurrent | $ 723 |  | 687
Interest rate, stated percentage | 0.41% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
2.25% notes due 2023 (2.25% 2023 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notes Payable, Noncurrent | $ 750 |  | 750
Interest rate, stated percentage | 2.25% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
3.625% notes due 2024 (3.625% 2024 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notes Payable, Noncurrent | $ 1,400 |  | 1,400
Interest rate, stated percentage | 3.625% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
3.125% notes due 2025 (3.125% 2025 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notes Payable, Noncurrent | $ 1,000 |  | 1,000
Interest rate, stated percentage | 3.125% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
2.00% €750 million notes due 2026 (2.00% 2026 euro Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notes Payable, Noncurrent | $ 886 |  | 789
Interest rate, stated percentage | 2.00% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
2.60% notes due 2026 (2.60% 2026 notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notes Payable, Noncurrent | $ 1,250 |  | 1,250
Interest rate, stated percentage | 2.60% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
5.50% pound-sterling denominated notes due 2026 (5.50% 2026 pound sterling Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notes Payable, Noncurrent | $ 636 |  | 586
Interest rate, stated percentage | 5.50% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
4.00% pound-sterling denominated notes due 2029 (4.00% 2029 pound sterling Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notes Payable, Noncurrent | $ 938 |  | 864
Interest rate, stated percentage | 4.00% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
6.375% notes due 2037 (6.375% 2037 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notes Payable, Noncurrent | $ 552 |  | 552
Interest rate, stated percentage | 6.375% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
6.90% notes due 2038 (6.90% 2038 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notes Payable, Noncurrent | $ 291 |  | 291
Interest rate, stated percentage | 6.90% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
6.40% notes due 2039 (6.40% 2039 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notes Payable, Noncurrent | $ 466 |  | 466
Interest rate, stated percentage | 6.40% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
5.75% notes due 2040 (5.75% 2040 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notes Payable, Noncurrent | $ 412 |  | 412
Interest rate, stated percentage | 5.75% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
4.95% notes due 2041 (4.95% 2041 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notes Payable, Noncurrent | $ 600 |  | 600
Interest rate, stated percentage | 4.95% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
5.15% notes due 2041 (5.15% 2041 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notes Payable, Noncurrent | $ 974 |  | 974
Interest rate, stated percentage | 5.15% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
5.65% notes due 2042 (5.65% 2042 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notes Payable, Noncurrent | $ 487 |  | 487
Interest rate, stated percentage | 5.65% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
5.375% notes due 2043 (5.375% 2043 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notes Payable, Noncurrent | $ 261 |  | 261
Interest rate, stated percentage | 5.375% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
4.40% notes due 2045 (4.40% 2045 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notes Payable, Noncurrent | $ 2,250 |  | 2,250
Interest rate, stated percentage | 4.40% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
4.563% notes due 2048 (4.563% 2048 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notes Payable, Noncurrent | $ 1,415 |  | 1,415
Interest rate, stated percentage | 4.563% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
4.663% notes due 2051 (4.663% 2051 Notes) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notes Payable, Noncurrent | $ 3,541 |  | 3,541
Interest rate, stated percentage | 4.663% |  |
Percentage of principal amount of notes that may be paid upon occurrence of change in control triggering event | 101.00% |  |
Other Notes Due 2097 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Notes Payable, Noncurrent | $ 100 |  | 100
Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Unamortized bond discounts, premiums and issuance costs, net | $ (928) |  | $ (936)

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