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Financing arrangements (Principal Amounts and Carrying Value of Long-term Borrowings) (Details) $ in Millions | Sep. 30, 2018 USD ($) | Sep. 30, 2018 EUR (€) | Sep. 30, 2018 CHF (SFr) | Sep. 30, 2018 GBP (£) | Dec. 31, 2017 USD ($)
--- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |
Unamortized discounts, premiums, issuance costs and fair value adjustments, net | $ (1,168) |  |  |  | $ (929)
Total carrying value of debt | 34,427 |  |  |  | 35,342
Less current portion | (5,077) |  |  |  | (1,152)
Total long-term debt | 29,350 |  |  |  | 34,190
Notes [Member] | 6.15% notes due 2018 (6.15% 2018 Notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 0 |  |  |  | 500
Interest rate, stated percentage | 6.15% | 6.15% | 6.15% | 6.15% |
Notes [Member] | 4.375% €550 million notes due 2018 (4.375% 2018 euro Notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 648 |  |  |  | 653
Face amount | € |  | € 550,000,000 |  |  |
Interest rate, stated percentage | 4.375% | 4.375% | 4.375% | 4.375% |
Notes [Member] | 5.70% notes due 2019 (5.70% 2019 Notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 1,000 |  |  |  | 1,000
Interest rate, stated percentage | 5.70% | 5.70% | 5.70% | 5.70% |
Notes [Member] | 1.90% notes due 2019 (1.90% 2019 Notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 700 |  |  |  | 700
Interest rate, stated percentage | 1.90% | 1.90% | 1.90% | 1.90% |
Notes [Member] | Floating Rate Notes due 2019 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 550 |  |  |  | 550
Notes [Member] | 2.20% notes due 2019 (2.20% 2019 Notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 1,400 |  |  |  | 1,400
Interest rate, stated percentage | 2.20% | 2.20% | 2.20% | 2.20% |
Notes [Member] | 2.125% €675 million notes due 2019 (2.125% 2019 euro Notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 783 |  |  |  | 810
Face amount | € |  | € 675,000,000 |  |  |
Interest rate, stated percentage | 2.125% | 2.125% | 2.125% | 2.125% |
Notes [Member] | 4.50% notes due 2020 (4.50% 2020 Notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 300 |  |  |  | 300
Interest rate, stated percentage | 4.50% | 4.50% | 4.50% | 4.50% |
Notes [Member] | 2.125% notes due 2020 (2.125% 2020 Notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 750 |  |  |  | 750
Interest rate, stated percentage | 2.125% | 2.125% | 2.125% | 2.125% |
Notes [Member] | Floating Rate Notes Due 2020 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 300 |  |  |  | 300
Notes [Member] | 2.20% notes due 2020 (2.20% 2020 Notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 700 |  |  |  | 700
Interest rate, stated percentage | 2.20% | 2.20% | 2.20% | 2.20% |
Notes [Member] | 3.45% notes due 2020 (3.45% 2020 Notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 900 |  |  |  | 900
Interest rate, stated percentage | 3.45% | 3.45% | 3.45% | 3.45% |
Notes [Member] | 4.10% notes due 2021 (4.10% 2021 Notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 1,000 |  |  |  | 1,000
Interest rate, stated percentage | 4.10% | 4.10% | 4.10% | 4.10% |
Notes [Member] | 1.85% notes due 2021 (1.85% 2021 Notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 750 |  |  |  | 750
Interest rate, stated percentage | 1.85% | 1.85% | 1.85% | 1.85% |
Notes [Member] | 3.875% notes due 2021 (3.875% 2021 Notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 1,750 |  |  |  | 1,750
Interest rate, stated percentage | 3.875% | 3.875% | 3.875% | 3.875% |
Notes [Member] | 1.25% €1,250 million notes due 2022 (1.25% 2022 euro Notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 1,451 |  |  |  | 1,501
Face amount | € |  | € 1,250,000,000 |  |  |
Interest rate, stated percentage | 1.25% | 1.25% | 1.25% | 1.25% |
Notes [Member] | 2.70% notes due 2022 (2.70% 2022 Notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 500 |  |  |  | 500
Interest rate, stated percentage | 2.70% | 2.70% | 2.70% | 2.70% |
Notes [Member] | 2.65% notes due 2022 (2.65% 2022 Notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 1,500 |  |  |  | 1,500
Interest rate, stated percentage | 2.65% | 2.65% | 2.65% | 2.65% |
Notes [Member] | 3.625% notes due 2022 (3.625% 2022 Notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 750 |  |  |  | 750
Interest rate, stated percentage | 3.625% | 3.625% | 3.625% | 3.625% |
Notes [Member] | 0.41% CHF700 million bonds due 2023 (0.41% 2023 Swiss franc Bonds) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 713 |  |  |  | 719
Face amount | SFr |  |  | SFr 700,000,000 |  |
Interest rate, stated percentage | 0.41% | 0.41% | 0.41% | 0.41% |
Notes [Member] | 2.25% notes due 2023 (2.25% 2023 Notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 750 |  |  |  | 750
Interest rate, stated percentage | 2.25% | 2.25% | 2.25% | 2.25% |
Notes [Member] | 3.625% notes due 2024 (3.625% 2024 Notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 1,400 |  |  |  | 1,400
Interest rate, stated percentage | 3.625% | 3.625% | 3.625% | 3.625% |
Notes [Member] | 3.125% notes due 2025 (3.125% 2025 Notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 1,000 |  |  |  | 1,000
Interest rate, stated percentage | 3.125% | 3.125% | 3.125% | 3.125% |
Notes [Member] | 2.00% €750 million notes due 2026 (2.00% 2026 euro Notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 870 |  |  |  | 901
Face amount | € |  | € 750,000,000 |  |  |
Interest rate, stated percentage | 2.00% | 2.00% | 2.00% | 2.00% |
Notes [Member] | 2.60% notes due 2026 (2.60% 2026 notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 1,250 |  |  |  | 1,250
Interest rate, stated percentage | 2.60% | 2.60% | 2.60% | 2.60% |
Notes [Member] | 5.50% £475 million notes due 2026 (5.50% 2026 pound sterling Notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 619 |  |  |  | 642
Face amount | £ |  |  |  | £ 475,000,000 |
Interest rate, stated percentage | 5.50% | 5.50% | 5.50% | 5.50% |
Notes [Member] | 3.20% notes due 2027 (3.20% 2027 Notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 1,000 |  |  |  | 1,000
Interest rate, stated percentage | 3.20% | 3.20% | 3.20% | 3.20% |
Notes [Member] | 4.00% £700 million notes due 2029 (4.00% 2029 pound sterling Notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 912 |  |  |  | 946
Face amount | £ |  |  |  | £ 700,000,000 |
Interest rate, stated percentage | 4.00% | 4.00% | 4.00% | 4.00% |
Notes [Member] | 6.375% notes due 2037 (6.375% 2037 Notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 552 |  |  |  | 552
Interest rate, stated percentage | 6.375% | 6.375% | 6.375% | 6.375% |
Notes [Member] | 6.90% notes due 2038 (6.90% 2038 Notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 291 |  |  |  | 291
Interest rate, stated percentage | 6.90% | 6.90% | 6.90% | 6.90% |
Notes [Member] | 6.40% notes due 2039 (6.40% 2039 Notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 466 |  |  |  | 466
Interest rate, stated percentage | 6.40% | 6.40% | 6.40% | 6.40% |
Notes [Member] | 5.75% notes due 2040 (5.75% 2040 Notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 412 |  |  |  | 412
Interest rate, stated percentage | 5.75% | 5.75% | 5.75% | 5.75% |
Notes [Member] | 4.95% notes due 2041 (4.95% 2041 Notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 600 |  |  |  | 600
Interest rate, stated percentage | 4.95% | 4.95% | 4.95% | 4.95% |
Notes [Member] | 5.15% notes due 2041 (5.15% 2041 Notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 974 |  |  |  | 974
Interest rate, stated percentage | 5.15% | 5.15% | 5.15% | 5.15% |
Notes [Member] | 5.65% notes due 2042 (5.65% 2042 Notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 487 |  |  |  | 487
Interest rate, stated percentage | 5.65% | 5.65% | 5.65% | 5.65% |
Notes [Member] | 5.375% notes due 2043 (5.375% 2043 Notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 261 |  |  |  | 261
Interest rate, stated percentage | 5.375% | 5.375% | 5.375% | 5.375% |
Notes [Member] | 4.40% notes due 2045 (4.40% 2045 Notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 2,250 |  |  |  | 2,250
Interest rate, stated percentage | 4.40% | 4.40% | 4.40% | 4.40% |
Notes [Member] | 4.563% notes due 2048 (4.563% 2048 Notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 1,415 |  |  |  | 1,415
Interest rate, stated percentage | 4.563% | 4.563% | 4.563% | 4.563% |
Notes [Member] | 4.663% notes due 2051 (4.663% 2051 Notes) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 3,541 |  |  |  | 3,541
Interest rate, stated percentage | 4.663% | 4.663% | 4.663% | 4.663% |
Notes [Member] | Other notes due 2097 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 100 |  |  |  | $ 100

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