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Debt and Borrowing Arrangements - Additional Information (Details) £ in Millions, SFr in Millions |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 23, 2018 USD ($) | Jul. 18, 2018 GBP (£) | Jul. 18, 2018 USD ($) | May 07, 2018 USD ($) | Apr. 17, 2018 USD ($) | Apr. 02, 2018 USD ($) | Mar. 02, 2018 USD ($) | Mar. 02, 2018 CAD ($) | Feb. 28, 2018 USD ($) | Feb. 01, 2018 USD ($) | Jan. 26, 2018 CHF (SFr) | Jan. 26, 2018 USD ($) | Oct. 13, 2016 | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2017 | May 03, 2018 USD ($) | Mar. 02, 2018 CAD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,811,000,000 |  | $ 4,811,000,000 |  |  |  |  | $ 3,517,000,000 |
Long-term debt repaid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,821,000,000 | $ 1,468,000,000 |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,948,000,000 | 350,000,000 |  |  |  |  |
Loss on debt extinguishment |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 140,000,000 | $ 11,000,000 |  |  |  |  |
Weighted-average interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.30% |  | 2.30% |  |  |  |  | 2.10% | 2.20%
Fair value of total debt |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20,364,000,000 |  | $ 20,364,000,000 |  |  |  |  | $ 18,354,000,000 |
Carrying value of total debt |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,064,000,000 |  | 20,064,000,000 |  |  |  |  | 17,652,000,000 |
Notes Payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal amount |  |  |  | $ 2,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,500,000,000 |  |  |
Proceeds from issuance of debt |  |  |  | 2,480,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 22,000,000 |  |  |
Debt repurchased amount |  |  |  |  | $ 570,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes Payable | 7.25% Pound Sterling-denominated Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt repaid |  | £ 76 | $ 99,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  | 7.25% | 7.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes Payable | 3.000% U.S. dollar-denominated Fixed-rate Notes Due May 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.00% |  |  |
Debt instrument, principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 750,000,000 |  |  |
Notes Payable | 3.625% U.S. dollar-denominated Fixed-rate Notes Due May 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.625% |  |  |
Debt instrument, principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 750,000,000 |  |  |
Notes Payable | 4.125% U.S. dollar-denominated Fixed-rate Notes Due May 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.125% |  |  |
Debt instrument, principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 700,000,000 |  |  |
Notes Payable | 4.625% U.S. dollar-denominated Fixed-rate Notes Due May 2048 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.625% |  |  |
Debt instrument, principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,000,000 |  |  |
Notes Payable | 6.500% U.S. dollar-denominated Notes Due February 2040 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  | 6.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt repurchased amount |  |  |  |  | $ 241,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes Payable | 5.375% U.S. dollar-denominated Notes Due February 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  | 5.375% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt repurchased amount |  |  |  |  | $ 97,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes Payable | 6.500% U.S. dollar-denominated Notes Due November 2031 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  | 6.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt repurchased amount |  |  |  |  | $ 75,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes Payable | 6.875% U.S. dollar-denominated Notes Due February 2038 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  | 6.875% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt repurchased amount |  |  |  |  | $ 72,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes Payable | 6.125% U.S. dollar-denominated Notes Due August 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt repaid | $ 280,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate | 6.125% |  |  |  | 6.125% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt repurchased amount |  |  |  |  | $ 42,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes Payable | 6.875% U.S. dollar-denominated Notes Due January 2039 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  | 6.875% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt repurchased amount |  |  |  |  | $ 29,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes Payable | 7.000% U.S. dollar-denominated Notes Due August 2037 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  | 7.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt repurchased amount |  |  |  |  | $ 11,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes Payable | 3.250% Canadian dollar-denominated Notes Due March 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  | 3.25% |  |  |  |  |  |  |  |  |  |  |  |  | 3.25% |  |
Debt instrument, principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 600,000,000 |  |
Debt issuance costs |  |  |  |  |  |  | $ 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt, net of discounts and underwriting fees |  |  |  |  |  |  | $ 461,000,000 | $ 595,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes Payable | 6.125% U.S. dollar-denominated Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt repaid |  |  |  |  |  |  |  |  |  | $ 478,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  |  |  |  | 6.125% |  |  |  |  |  |  |  |  |  |  |  |
Notes Payable | 0.080% Swiss franc-denominated Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt repaid |  |  |  |  |  |  |  |  |  |  | SFr 250 | $ 260,000,000 |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  |  |  |  |  | 0.08% | 0.08% |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  | $ 1,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit, expiration period |  |  |  |  |  |  |  |  | 364 days |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility expiration date |  |  |  |  |  |  |  |  | Feb. 27, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility outstanding amount |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  |  |  |  |  |
Revolving Credit Facility, October 11, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  | $ 4,500,000,000 |  |  |  |  | 4,500,000,000 |  | 4,500,000,000 |  |  |  |  |  |
Revolving credit facility expiration date |  |  |  |  |  |  |  |  |  |  |  |  | Oct. 11, 2018 |  |  |  |  | Oct. 11, 2021 |  |  |  |
Line of credit facility outstanding amount |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  |  |  |  |  |
Revolving credit facility debt covenant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 24,600,000,000 |  |  |  |  |  |
Total shareholders' equity, excluding accumulated other comprehensive earnings / (losses) |  |  |  |  |  |  |  |  |  |  |  |  |  | 36,100,000,000 |  | 36,100,000,000 |  |  |  |  |  |
International Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,900,000,000 |  | 1,900,000,000 |  |  |  |  | 2,000,000,000.0 |
Commercial paper |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,602,000,000 |  | $ 4,602,000,000 |  |  |  |  | 3,410,000,000 |
Commercial paper | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper, maturity period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 day |  |  |  |  |  |
Commercial paper | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper, maturity period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 82 days |  |  |  |  |  |
Bank loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 209,000,000 |  | $ 209,000,000 |  |  |  |  | $ 107,000,000 |
Bank loans | Revolving Credit Facility | 364-Day Senior Unsecured Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  |  |  |  |  | $ 2,000,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit, expiration period |  |  |  |  |  | 364 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings from lines of credit |  |  |  |  | $ 714,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of lines of credit |  |  |  | $ 714,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on debt extinguishment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 140,000,000 |  |  |  |  |  |

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- Definition Face (par) amount of the original debt instrument that was repurchased. + References No definition available. + Details
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- Definition Amount of unamortized debt discount (premium) and debt issuance costs. + 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)(2) -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 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
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- Definition Weighted average interest rate of debt outstanding. + References No definition available. + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=114001942&loc=d3e12355-112629 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114001942&loc=d3e12317-112629 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: 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 2: 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 Reference 3: 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=6879938&loc=d3e572229-122910 + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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