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Face (par) amount of debt instrument at time of issuance.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Face (par) amount of the original debt instrument that was repurchased.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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Weighted average interest rate of debt outstanding.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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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.

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Date the credit facility terminates, in CCYY-MM-DD format.

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Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Debt and Borrowing Arrangements - Additional Information (Details) SFr in Millions											3 Months Ended		6 Months Ended		12 Months Ended
	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 ($)	Jan. 26, 2018 USD ($)	Jan. 26, 2018 CHF (SFr)	Oct. 13, 2016	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Sep. 30, 2017	May 03, 2018 USD ($)	Mar. 02, 2018 CAD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016
Debt Instrument [Line Items]
Proceeds from issuance of debt													$ 2,948,000,000	$ 350,000,000
Loss on debt extinguishment											$ 140,000,000	$ 11,000,000	140,000,000	11,000,000
Long-term debt repaid													$ 1,442,000,000	$ 1,469,000,000
Weighted-average interest rate											2.40%		2.40%					2.10%	2.20%
Fair value of total debt											$ 20,089,000,000		$ 20,089,000,000					$ 18,354,000,000
Carrying value of total debt											19,711,000,000		19,711,000,000					17,652,000,000
Notes Payable
Debt Instrument [Line Items]
Debt instrument, principal amount																$ 2,500,000,000.0
Proceeds from issuance of debt	$ 2,480,000,000
Debt issuance costs																22,000,000
Debt repurchased amount		$ 570,000,000
Notes Payable \| 3.000% U.S. dollar-denominated Fixed-rate Notes Due May 2020
Debt Instrument [Line Items]
Debt instrument, principal amount																$ 750,000,000
Debt instrument, interest rate																3.00%
Notes Payable \| 3.625% U.S. dollar-denominated Fixed-rate Notes Due May 2023
Debt Instrument [Line Items]
Debt instrument, principal amount																$ 750,000,000
Debt instrument, interest rate																3.625%
Notes Payable \| 4.125% U.S. dollar-denominated Fixed-rate Notes Due May 2028
Debt Instrument [Line Items]
Debt instrument, principal amount																$ 700,000,000
Debt instrument, interest rate																4.125%
Notes Payable \| 4.625% U.S. dollar-denominated Fixed-rate Notes Due May 2048
Debt Instrument [Line Items]
Debt instrument, principal amount																$ 300,000,000
Debt instrument, interest rate																4.625%
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]
Debt instrument, interest rate		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, principal amount																	$ 600,000,000
Debt instrument, interest rate				3.25%													3.25%
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]
Debt instrument, interest rate							6.125%
Long-term debt repaid							$ 478,000,000
Notes Payable \| 0.080% Swiss franc-denominated Notes
Debt Instrument [Line Items]
Debt instrument, interest rate								0.08%	0.08%
Long-term debt repaid								$ 260,000,000	SFr 250
Revolving Credit Facility
Debt Instrument [Line Items]
Revolving credit facility, maximum borrowing capacity						$ 1,500,000,000
Line of credit facility outstanding amount											0		0
Line of credit, expiration period						364 days
Revolving credit facility expiration date						Feb. 27, 2019
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
Line of credit facility outstanding amount											0		0
Revolving credit facility expiration date										Oct. 11, 2018					Oct. 11, 2021
Revolving credit facility debt covenant													24,600,000,000
Total shareholders' equity, excluding accumulated other comprehensive earnings / (losses)											35,700,000,000		35,700,000,000
International Subsidiaries
Debt Instrument [Line Items]
Revolving credit facility, maximum borrowing capacity											$ 1,800,000,000		$ 1,800,000,000					$ 2,000,000,000
Commercial paper \| Minimum
Debt Instrument [Line Items]
Commercial paper, maturity period													2 days
Commercial paper \| Maximum
Debt Instrument [Line Items]
Commercial paper, maturity period													172 days
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
Borrowings from line of credit facility		$ 714,000,000
Repayments of lines of credit	$ 714,000,000
Line of credit, expiration period			364 days
Loss on debt extinguishment													$ 140,000,000