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Financing arrangements (Principal Amounts and Carrying Value of Long-term Borrowings) (Details) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2019 EUR (€) | Dec. 31, 2019 CHF (SFr) | Dec. 31, 2019 GBP (£) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Carrying values of long-term borrowings |  |  |  |  |  |
Unamortized bond discounts, premiums and issuance costs, net | $ (868) |  |  |  | $ (896) |
Fair value adjustments | 296 |  |  |  | (53) |
Total carrying value of debt | 29,903 |  |  |  | 33,929 |
Less current portion | (2,953) |  |  |  | (4,419) |
Total long-term debt | $ 26,950 |  |  |  | 29,510 |
0.41% 2023 Swiss franc Bonds [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage | 0.41% | 0.41% | 0.41% | 0.41% |  |
5.50% pound-sterling-denominated notes due 2026 (5.50% 2026 pound sterling Notes) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage | 5.50% | 5.50% | 5.50% | 5.50% |  |
Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Face amount |  |  |  |  |  | $ 4,500
Notes [Member] | 5.70% notes due 2019 (5.70% 2019 Notes) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage | 5.70% | 5.70% | 5.70% | 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 |  |  |  |  |  |
Long-term debt, gross |  |  |  |  | 1,000 |
Notes [Member] | 1.90% notes due 2019 (1.90% 2019 Notes) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage | 1.90% | 1.90% | 1.90% | 1.90% |  | 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 |  |  |  |  |  |
Long-term debt, gross | $ 0 |  |  |  | 700 |
Notes [Member] | 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 |  |  |  |  |  |
Long-term debt, gross |  |  |  |  | 550 |
Notes [Member] | 2.20% notes due 2019 (2.20% 2019 Notes) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage | 2.20% | 2.20% | 2.20% | 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 |  |  |  |  |  |
Long-term debt, gross |  |  |  |  | 1,400 |
Notes [Member] | 2.125% euro-denominated notes due 2019 (2.125% 2019 euro Notes) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage | 2.125% | 2.125% | 2.125% | 2.125% |  |
Face amount | € |  | € 675,000,000 |  |  |  |
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 |  |  |  |  |  |
Long-term debt, gross |  |  |  |  | 774 |
Notes [Member] | 4.50% notes due 2020 (4.50% 2020 Notes) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage | 4.50% | 4.50% | 4.50% | 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 |  |  |  |  |  |
Long-term debt, gross | $ 300 |  |  |  | 300 |
Notes [Member] | 2.125% notes due 2020 (2.125% 2020 Notes) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage | 2.125% | 2.125% | 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 |  |  |  |  |  |
Long-term debt, gross | $ 750 |  |  |  | 750 |
Notes [Member] | 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 |  |  |  |  |  |
Long-term debt, gross | $ 300 |  |  |  | 300 |
Notes [Member] | 2.20% notes due 2020 (2.20% 2020 Notes) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage | 2.20% | 2.20% | 2.20% | 2.20% |  | 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 |  |  |  |  |  |
Long-term debt, gross | $ 700 |  |  |  | 700 |
Notes [Member] | 3.45% notes due 2020 (3.45% 2020 Notes) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage | 3.45% | 3.45% | 3.45% | 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 |  |  |  |  |  |
Long-term debt, gross | $ 900 |  |  |  | 900 |
Notes [Member] | 4.10% notes due 2021 (4.10% 2021 Notes) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage | 4.10% | 4.10% | 4.10% | 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 |  |  |  |  |  |
Long-term debt, gross | $ 1,000 |  |  |  | 1,000 |
Notes [Member] | 1.85% notes due 2021 (1.85% 2021 Notes) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage | 1.85% | 1.85% | 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 |  |  |  |  |  |
Long-term debt, gross | $ 750 |  |  |  | 750 |
Notes [Member] | 3.875% notes due 2021 (3.875% 2021 Notes) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage | 3.875% | 3.875% | 3.875% | 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 |  |  |  |  |  |
Long-term debt, gross | $ 1,750 |  |  |  | 1,750 |
Notes [Member] | 1.25% notes due 2022 (1.25% 2022 euro Notes) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage | 1.25% | 1.25% | 1.25% | 1.25% |  |
Face amount | € |  | € 1,250,000,000 |  |  |  |
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 |  |  |  |  |  |
Long-term debt, gross | $ 1,402 |  |  |  | 1,433 |
Notes [Member] | 2.70% notes due 2022 (2.70% 2022 Notes) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage | 2.70% | 2.70% | 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 |  |  |  |  |  |
Long-term debt, gross | $ 500 |  |  |  | 500 |
Notes [Member] | 2.65% notes due 2022 (2.65% 2022 Notes) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage | 2.65% | 2.65% | 2.65% | 2.65% |  | 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 |  |  |  |  |  |
Long-term debt, gross | $ 1,500 |  |  |  | 1,500 |
Notes [Member] | 3.625% notes due 2022 (3.625% 2022 Notes) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage | 3.625% | 3.625% | 3.625% | 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 |  |  |  |  |  |
Long-term debt, gross | $ 750 |  |  |  | 750 |
Notes [Member] | 0.41% 2023 Swiss franc Bonds [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage | 0.41% | 0.41% | 0.41% | 0.41% |  |
Face amount | SFr |  |  | SFr 700,000,000 |  |  |
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 |  |  |  |  |  |
Long-term debt, gross | $ 725 |  |  |  | 713 |
Notes [Member] | 2.25% notes due 2023 (2.25% 2023 Notes) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage | 2.25% | 2.25% | 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 |  |  |  |  |  |
Long-term debt, gross | $ 750 |  |  |  | 750 |
Notes [Member] | 3.625% notes due 2024 (3.625% 2024 Notes) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage | 3.625% | 3.625% | 3.625% | 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 |  |  |  |  |  |
Long-term debt, gross | $ 1,400 |  |  |  | 1,400 |
Notes [Member] | 3.125% notes due 2025 (3.125% 2025 Notes) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage | 3.125% | 3.125% | 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 |  |  |  |  |  |
Long-term debt, gross | $ 1,000 |  |  |  | 1,000 |
Notes [Member] | 2.00% 2026 euro Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage | 2.00% | 2.00% | 2.00% | 2.00% |  |
Face amount | € |  | € 750,000,000 |  |  |  |
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 |  |  |  |  |  |
Long-term debt, gross | $ 841 |  |  |  | 860 |
Notes [Member] | 2.60% notes due 2026 (2.60% 2026 notes) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage | 2.60% | 2.60% | 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 |  |  |  |  |  |
Long-term debt, gross | $ 1,250 |  |  |  | 1,250 |
Notes [Member] | 5.50% pound-sterling-denominated notes due 2026 (5.50% 2026 pound sterling Notes) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage | 5.50% | 5.50% | 5.50% | 5.50% |  |
Face amount | £ |  |  |  | £ 475,000,000 |  |
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 |  |  |  |  |  |
Long-term debt, gross | $ 630 |  |  |  | 606 |
Notes [Member] | 3.20% notes due 2027 (3.20% 2027 Notes) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage | 3.20% | 3.20% | 3.20% | 3.20% |  | 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 |  |  |  |  |  |
Long-term debt, gross | $ 1,000 |  |  |  | 1,000 |
Notes [Member] | 4.00% pound-sterling-denominated notes due 2029 (4.00% 2029 pound sterling Notes) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage | 4.00% | 4.00% | 4.00% | 4.00% |  |
Face amount | £ |  |  |  | £ 700,000,000 |  |
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 |  |  |  |  |  |
Long-term debt, gross | $ 928 |  |  |  | 893 |
Notes [Member] | 6.375% notes due 2037 (6.375% 2037 Notes) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage | 6.375% | 6.375% | 6.375% | 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 |  |  |  |  |  |
Long-term debt, gross | $ 552 |  |  |  | 552 |
Notes [Member] | 6.90% notes due 2038 (6.90% 2038 Notes) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage | 6.90% | 6.90% | 6.90% | 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 |  |  |  |  |  |
Long-term debt, gross | $ 291 |  |  |  | 291 |
Notes [Member] | 6.40% notes due 2039 (6.40% 2039 Notes) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage | 6.40% | 6.40% | 6.40% | 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 |  |  |  |  |  |
Long-term debt, gross | $ 466 |  |  |  | 466 |
Notes [Member] | 5.75% notes due 2040 (5.75% 2040 Notes) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage | 5.75% | 5.75% | 5.75% | 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 |  |  |  |  |  |
Long-term debt, gross | $ 412 |  |  |  | 412 |
Notes [Member] | 4.95% notes due 2041 (4.95% 2041 Notes) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage | 4.95% | 4.95% | 4.95% | 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 |  |  |  |  |  |
Long-term debt, gross | $ 600 |  |  |  | 600 |
Notes [Member] | 5.15% notes due 2041 (5.15% 2041 Notes) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage | 5.15% | 5.15% | 5.15% | 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 |  |  |  |  |  |
Long-term debt, gross | $ 974 |  |  |  | 974 |
Notes [Member] | 5.65% notes due 2042 (5.65% 2042 Notes) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage | 5.65% | 5.65% | 5.65% | 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 |  |  |  |  |  |
Long-term debt, gross | $ 487 |  |  |  | 487 |
Notes [Member] | 5.375% notes due 2043 (5.375% 2043 Notes) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage | 5.375% | 5.375% | 5.375% | 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 |  |  |  |  |  |
Long-term debt, gross | $ 261 |  |  |  | 261 |
Notes [Member] | 4.40% notes due 2045 (4.40% 2045 Notes) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage | 4.40% | 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 |  |  |  |  |  |
Long-term debt, gross | $ 2,250 |  |  |  | 2,250 |
Notes [Member] | 4.563% notes due 2048 (4.563% 2048 Notes) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage | 4.563% | 4.563% | 4.563% | 4.563% |  |
Effective interest rate on note | 6.30% | 6.30% | 6.30% | 6.30% |  |
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 |  |  |  |  |  |
Long-term debt, gross | $ 1,415 |  |  |  | 1,415 |
Notes [Member] | 4.663% notes due 2051 (4.663% 2051 Notes) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, stated percentage | 4.663% | 4.663% | 4.663% | 4.663% |  |
Effective interest rate on note | 5.60% | 5.60% | 5.60% | 5.60% |  |
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 |  |  |  |  |  |
Long-term debt, gross | $ 3,541 |  |  |  | 3,541 |
Notes [Member] | Other notes due 2097 [Member] |  |  |  |  |  |
Carrying values of long-term borrowings |  |  |  |  |  |
Long-term debt, gross | $ 100 |  |  |  | $ 100 |
Debt securities payable [Member] | Minimum [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Redemption period without payment of make whole amount | 1 month |  |  |  |  |
Debt securities payable [Member] | Maximum [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Redemption period without payment of make whole amount | 6 months |  |  |  |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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