Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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Description of a feature that permits the issuer of the debt to repay or convert it before the stated maturity date (early retirement date). The description may include such items as the call price, the period that the issuer can call the debt, including the earliest call date, and other significant terms of the call feature, which may include the debt holders' ability to convert the debt to equity if the call option is exercised and contingent events that trigger the issuer's ability to call the debt.

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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.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount, after accumulated amortization, of debt discount (premium).

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount of cumulative increase (decrease) in fair value of hedged liability in fair value hedge, attributable to hedged risk.

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Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

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Debt Outstanding Debt (Details) - USD ($) $ in Millions	6 Months Ended
Debt Outstanding Debt (Details) - USD ($) $ in Millions	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total Borrowings at Par Value	$ 19,649		$ 21,175
Fair Value Hedge Accounting Adjustments	(132)		(70)
Unamortized Discount, Net	(11)		(2)
Unamortized Debt Issuance Costs	(86)		(95)
Total Borrowings at Carrying Value	19,420		21,008
Less: Short-term Obligations and Current Maturities	1,711		2,135
Long-term Obligations	$ 17,709	$ 18,870	18,873
Commercial Paper Programs [Member]
Debt Instrument [Line Items]
Effective Interest Rate	0.00%
Total Borrowings at Par Value	$ 1,005		960
Total Borrowings at Carrying Value	1,005		960
Senior Notes [Member]
Debt Instrument [Line Items]
Total Borrowings at Carrying Value	$ 18,392		20,024
Debt Instrument, Call Feature	Each of the notes may be redeemed at a redemption price of 100% of the principal amount plus a specified make-whole premium and accrued interest.
Senior Notes [Member] \| Floating Rate 2-Year Senior Notes, Due 8/9/2018 (euro-denominated) [Member]
Debt Instrument [Line Items]
Debt Instrument, Term	2 years
Debt Instrument, Maturity Date	Aug. 09, 2018
Effective Interest Rate	0.37%
Total Borrowings at Par Value	$ 701		721
Senior Notes [Member] \| 2.15% 3-Year Senior Notes, Due 12/14/2018 [Member]
Debt Instrument [Line Items]
Stated Interest Rate	2.15%
Debt Instrument, Term	3 years
Debt Instrument, Maturity Date	Dec. 14, 2018
Total Borrowings at Par Value			450
Senior Notes [Member] \| 2.40% 5-Year Senior Notes, Due 2/1/2019 [Member]
Debt Instrument [Line Items]
Stated Interest Rate	2.40%
Debt Instrument, Term	5 years
Debt Instrument, Maturity Date	Feb. 01, 2019
Total Borrowings at Par Value			900
Senior Notes [Member] \| Floating Rate 2-Year Senior Notes, Due 7/24/2019 (euro-denominated) [Member]
Debt Instrument [Line Items]
Debt Instrument, Term	2 years
Debt Instrument, Maturity Date	Jul. 24, 2019
Effective Interest Rate	0.10%
Total Borrowings at Par Value	$ 584		600
Senior Notes [Member] \| 6.00% 10-Year Senior Notes, Due 3/1/2020 [Member]
Debt Instrument [Line Items]
Stated Interest Rate	6.00%
Debt Instrument, Term	10 years
Debt Instrument, Maturity Date	Mar. 01, 2020
Effective Interest Rate	2.97%
Total Borrowings at Par Value	$ 750		750
Senior Notes [Member] \| 4.70% 10-Year Senior Notes, Due 5/1/2020 [Member]
Debt Instrument [Line Items]
Stated Interest Rate	4.70%
Debt Instrument, Term	10 years
Debt Instrument, Maturity Date	May 01, 2020
Effective Interest Rate	4.23%
Total Borrowings at Par Value	$ 300		300
Senior Notes [Member] \| 1.50% 5-Year Senior Notes, Due 12/1/2020 (euro-denominated) [Member]
Debt Instrument [Line Items]
Stated Interest Rate	1.50%
Debt Instrument, Term	5 years
Debt Instrument, Maturity Date	Dec. 01, 2020
Effective Interest Rate	1.62%
Total Borrowings at Par Value	$ 497		510
Senior Notes [Member] \| 5.00% 10-Year Senior Notes, Due 1/15/2021 [Member]
Debt Instrument [Line Items]
Stated Interest Rate	5.00%
Debt Instrument, Term	10 years
Debt Instrument, Maturity Date	Jan. 15, 2021
Effective Interest Rate	3.25%
Total Borrowings at Par Value	$ 400		400
Senior Notes [Member] \| 4.50% 10-Year Senior Notes, Due 3/1/2021 [Member]
Debt Instrument [Line Items]
Stated Interest Rate	4.50%
Debt Instrument, Term	10 years
Debt Instrument, Maturity Date	Mar. 01, 2021
Effective Interest Rate	6.74%
Total Borrowings at Par Value	$ 1,000		1,000
Senior Notes [Member] \| 3.60% 10-Year Senior Notes, Due 8/15/2021 [Member]
Debt Instrument [Line Items]
Stated Interest Rate	3.60%
Debt Instrument, Term	10 years
Debt Instrument, Maturity Date	Aug. 15, 2021
Effective Interest Rate	6.55%
Total Borrowings at Par Value	$ 1,100		1,100
Senior Notes [Member] \| 3.30% 7-Year Senior Notes, Due 2/15/2022 [Member]
Debt Instrument [Line Items]
Stated Interest Rate	3.30%
Debt Instrument, Term	7 years
Debt Instrument, Maturity Date	Feb. 15, 2022
Effective Interest Rate	3.42%
Total Borrowings at Par Value	$ 800		800
Senior Notes [Member] \| 2.15% 7-Year Senior Notes, Due 7/21/2022 (euro-denominated) [Member]
Debt Instrument [Line Items]
Stated Interest Rate	2.15%
Debt Instrument, Term	7 years
Debt Instrument, Maturity Date	Jul. 21, 2022
Effective Interest Rate	2.28%
Total Borrowings at Par Value	$ 584		600
Senior Notes [Member] \| 3.15% 10-Year Senior Notes, Due 1/15/2023 [Member]
Debt Instrument [Line Items]
Stated Interest Rate	3.15%
Debt Instrument, Term	10 years
Debt Instrument, Maturity Date	Jan. 15, 2023
Effective Interest Rate	3.31%
Total Borrowings at Par Value	$ 800		800
Senior Notes [Member] \| 3.00% 7-Year Senior Notes, Due 4/15/2023 [Member]
Debt Instrument [Line Items]
Stated Interest Rate	3.00%
Debt Instrument, Term	7 years
Debt Instrument, Maturity Date	Apr. 15, 2023
Effective Interest Rate	6.76%
Total Borrowings at Par Value	$ 1,000		1,000
Senior Notes [Member] \| 4.15% 10-Year Senior Notes, Due 2/1/2024 [Member]
Debt Instrument [Line Items]
Stated Interest Rate	4.15%
Debt Instrument, Term	10 years
Debt Instrument, Maturity Date	Feb. 01, 2024
Effective Interest Rate	4.16%
Total Borrowings at Par Value	$ 1,000		1,000
Senior Notes [Member] \| 0.75% 8-Year Senior Notes, Due 9/12/2024 (euro-denominated) [Member]
Debt Instrument [Line Items]
Stated Interest Rate	0.75%
Debt Instrument, Term	8 years
Debt Instrument, Maturity Date	Sep. 12, 2024
Effective Interest Rate	0.94%
Total Borrowings at Par Value	$ 1,168		1,201
Senior Notes [Member] \| 2.00% 10-Year Senior Notes, Due 4/15/2025 (euro-denominated) [Member]
Debt Instrument [Line Items]
Stated Interest Rate	2.00%
Debt Instrument, Term	10 years
Debt Instrument, Maturity Date	Apr. 15, 2025
Effective Interest Rate	2.10%
Total Borrowings at Par Value	$ 748		768
Senior Notes [Member] \| 3.65% 10-Year Senior Notes, Due 12/15/2025 [Member]
Debt Instrument [Line Items]
Stated Interest Rate	3.65%
Debt Instrument, Term	10 years
Debt Instrument, Maturity Date	Dec. 15, 2025
Effective Interest Rate	3.77%
Total Borrowings at Par Value	$ 350		350
Senior Notes [Member] \| 1.40% 8.5-Year Senior Notes, Due 1/23/2026 (euro-denominated) [Member]
Debt Instrument [Line Items]
Stated Interest Rate	1.40%
Debt Instrument, Term	8 years 6 months
Debt Instrument, Maturity Date	Jan. 23, 2026
Effective Interest Rate	1.53%
Total Borrowings at Par Value	$ 818		840
Senior Notes [Member] \| 2.95% 10-Year Senior Notes, Due 9/19/2026 [Member]
Debt Instrument [Line Items]
Stated Interest Rate	2.95%
Debt Instrument, Term	10 years
Debt Instrument, Maturity Date	Sep. 19, 2026
Effective Interest Rate	3.19%
Total Borrowings at Par Value	$ 1,200		1,200
Senior Notes [Member] \| 1.45% 10-Year Senior Notes, Due 3/16/2027 (euro-denominated) [Member]
Debt Instrument [Line Items]
Stated Interest Rate	1.45%
Debt Instrument, Term	10 years
Debt Instrument, Maturity Date	Mar. 16, 2027
Effective Interest Rate	1.66%
Total Borrowings at Par Value	$ 584		600
Senior Notes [Member] \| 3.20% 10-Year Senior Notes, Due 8/15/2027 [Member]
Debt Instrument [Line Items]
Stated Interest Rate	3.20%
Debt Instrument, Term	10 years
Debt Instrument, Maturity Date	Aug. 15, 2027
Effective Interest Rate	3.39%
Total Borrowings at Par Value	$ 750		750
Senior Notes [Member] \| 1.375% 12-Year Senior Notes, Due 9/12/2028 (euro-denominated) [Member]
Debt Instrument [Line Items]
Stated Interest Rate	1.375%
Debt Instrument, Term	12 years
Debt Instrument, Maturity Date	Sep. 12, 2028
Effective Interest Rate	1.46%
Total Borrowings at Par Value	$ 701		721
Senior Notes [Member] \| 1.95% 12-Year Senior Notes, Due 7/24/2029 (euro-denominated) [Member]
Debt Instrument [Line Items]
Stated Interest Rate	1.95%
Debt Instrument, Term	12 years
Debt Instrument, Maturity Date	Jul. 24, 2029
Effective Interest Rate	2.08%
Total Borrowings at Par Value	$ 818		840
Senior Notes [Member] \| 2.875% 20-Year Senior Notes, Due 7/24/2037 (euro-denominated) [Member]
Debt Instrument [Line Items]
Stated Interest Rate	2.875%
Debt Instrument, Term	20 years
Debt Instrument, Maturity Date	Jul. 24, 2037
Effective Interest Rate	2.94%
Total Borrowings at Par Value	$ 818		840
Senior Notes [Member] \| 5.30% 30-Year Senior Notes, Due 2/1/2044 [Member]
Debt Instrument [Line Items]
Stated Interest Rate	5.30%
Debt Instrument, Term	30 years
Debt Instrument, Maturity Date	Feb. 01, 2044
Effective Interest Rate	5.37%
Total Borrowings at Par Value	$ 400		400
Senior Notes [Member] \| 4.10% 30-Year Senior Notes, Due 8/15/2047 [Member]
Debt Instrument [Line Items]
Stated Interest Rate	4.10%
Debt Instrument, Term	30 years
Debt Instrument, Maturity Date	Aug. 15, 2047
Effective Interest Rate	4.23%
Total Borrowings at Par Value	$ 750		750
Other Debt [Member]
Debt Instrument [Line Items]
Total Borrowings at Par Value	23		24
Total Borrowings at Carrying Value	$ 23		$ 24