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Financing arrangements (Principal Amounts and Carrying Value of Long-term Borrowings) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Unamortized bond discounts, premiums and issuance costs, net	$ (920)	$ (929)
Total carrying value of debt	35,541	35,342
Less current portion	(2,183)	(1,152)
Total noncurrent debt	33,358	34,190
Notes [Member] | 6.15% notes due 2018 (6.15% 2018 Notes) [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 500	500
Interest rate, stated percentage	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	$ 684	653
Interest rate, stated percentage	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%
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%
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%
Notes [Member] | 2.125% Euro Notes Due 2019 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 832	810
Interest rate, stated percentage	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%
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%
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%
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%
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%
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%
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%
Notes [Member] | 1.25% €1,250 million notes due 2022 (1.25% 2022 euro Notes) [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 1,541	1,501
Interest rate, stated percentage	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%
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%
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%
Notes [Member] | 0.41% Swiss-franc-denominated bonds due 2023 (0.41% 2023 Swiss franc Bonds) [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 734	719
Interest rate, stated percentage	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%
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%
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%
Notes [Member] | 2.00% €750 million notes due 2026 (2.00% 2026 euro Notes) [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 924	901
Interest rate, stated percentage	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%
Notes [Member] | 5.50% pound-sterling denominated notes due 2026 (5.50% 2026 pound sterling Notes) [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 666	642
Interest rate, stated percentage	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%
Notes [Member] | 4.00% pound-sterling denominated notes due 2029 (4.00% 2029 pound sterling Notes) [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 981	946
Interest rate, stated percentage	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%
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%
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%
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%
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%
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%
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%
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%
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%
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%
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%
Notes [Member] | Other notes due 2097 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 100	$ 100

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

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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