Short-Term Borrowings and Long-Term Debt (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Bank credit facilities	$ 10,000	$ 0
Par Value	50,631	39,817
Carrying value, Combined Amount	50,509	39,474
Fair Value	55,388	44,234
Commercial Paper [Member]
Debt Instrument [Line Items]
Commercial Paper	1,213	400
Par Value	1,214	400
Fair Value	$ 1,213	400
2.700% Notes due July 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.70%
Par Value	$ 1,500	1,500
Carrying Value, Current	1,500	1,499
Fair Value	1,500	1,506
Floating rate notes due October 2020 [Member]
Debt Instrument [Line Items]
Par Value	300	300
Carrying Value, Current	300	300
Fair Value	$ 296	300
3.875% notes due October 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.875%
Par Value	$ 450	450
Carrying Value, Current	452	450
Fair Value	$ 452	455
1.950% notes due October 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.95%
Par Value	$ 900	900
Carrying Value, Current	899	899
Fair Value	$ 900	900
4.700% notes due February 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.70%
Par Value	$ 400	400
Carrying Value, Current	406
Carrying Value, Noncurrent		403
Fair Value	$ 407	410
2.125% notes due March 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.125%
Par Value	$ 750	750
Carrying Value, Current	749
Carrying Value, Noncurrent		749
Fair Value	750	753
Floating rate notes due June 2021 [Member]
Debt Instrument [Line Items]
Par Value	350	350
Carrying Value, Noncurrent	349	349
Fair Value	$ 347	350
3.150% notes due June 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.15%
Par Value	$ 400	400
Carrying Value, Noncurrent	399	399
Fair Value	$ 406	407
3.375% notes due November 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.375%
Par Value	$ 500	500
Carrying Value, Noncurrent	510	501
Fair Value	$ 512	512
2.875% notes due December 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.875%
Par Value	$ 750	750
Carrying Value, Noncurrent	768	753
Fair Value	$ 764	765
2.875% notes due March 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.875%
Par Value	$ 1,100	1,100
Carrying Value, Noncurrent	1,114	1,087
Fair Value	$ 1,130	1,121
3.350% notes due July 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.35%
Par Value	$ 1,000	1,000
Carrying Value, Noncurrent	998	998
Fair Value	$ 1,034	1,036
2.375% notes due October 2022 [Member] [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.375%
Par Value	$ 900	900
Carrying Value, Noncurrent	896	896
Fair Value	$ 912	911
Zero Coupon notes due November 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	0.00%
Par Value	$ 15	15
Carrying Value, Noncurrent	13	13
Fair Value	$ 14	14
2.750% notes due February 2023 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.75%
Par Value	$ 625	625
Carrying Value, Noncurrent	646	624
Fair Value	$ 640	638
2.875% notes due March 2023 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.875%
Par Value	$ 750	750
Carrying Value, Noncurrent	797	770
Fair Value	$ 777	770
3.500% notes due June 2023 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.50%
Par Value	$ 750	750
Carrying Value, Noncurrent	747	747
Fair Value	$ 788	786
3.500% notes due February 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.50%
Par Value	$ 750	750
Carrying Value, Noncurrent	746	746
Fair Value	$ 794	792
2.375% notes due August 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.375%
Par Value	$ 750	750
Carrying Value, Noncurrent	747	747
Fair Value	$ 767	760
3.750% notes due July 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.75%
Par Value	$ 2,000	2,000
Carrying Value, Noncurrent	1,991	1,990
Fair Value	$ 2,161	2,161
3.700% notes due December 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.70%
Par Value	$ 300	300
Carrying Value, Noncurrent	298	298
Fair Value	$ 323	325
3.100% notes due March 2026 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.10%
Par Value	$ 1,000	1,000
Carrying Value, Noncurrent	996	996
Fair Value	$ 1,056	1,048
3.450% notes due January 2027 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.45%
Par Value	$ 750	750
Carrying Value, Noncurrent	746	746
Fair Value	$ 804	804
3.375% notes due April 2027 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.375%
Par Value	$ 625	625
Carrying Value, Noncurrent	620	620
Fair Value	$ 668	667
2.950% notes due October 2027 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.95%
Par Value	$ 950	950
Carrying Value, Noncurrent	939	939
Fair Value	$ 992	988
3.850% notes due June 2028 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.85%
Par Value	$ 1,150	1,150
Carrying Value, Noncurrent	1,143	1,142
Fair Value	$ 1,281	1,269
3.875% notes due December 2028 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.875%
Par Value	$ 850	850
Carrying Value, Noncurrent	843	843
Fair Value	$ 953	941
2.875% notes due August 2029 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.875%
Par Value	$ 1,000	1,000
Carrying Value, Noncurrent	1,104	993
Fair Value	$ 1,047	1,029
4.625% notes due July 2035 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.625%
Par Value	$ 1,000	1,000
Carrying Value, Noncurrent	992	992
Fair Value	$ 1,190	1,215
5.800% notes due March 2036 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.80%
Par Value	$ 850	850
Carrying Value, Noncurrent	838	838
Fair Value	$ 1,107	1,129
6.500% Notes Due June 2037 [Member] [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.50%
Par Value	$ 500	500
Carrying Value, Noncurrent	492	492
Fair Value	$ 691	712
6.625% Notes due November 2037 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.625%
Par Value	$ 650	650
Carrying Value, Noncurrent	641	641
Fair Value	$ 910	940
6.875% notes due February 2038 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.875%
Par Value	$ 1,100	1,100
Carrying Value, Noncurrent	1,077	1,076
Fair Value	$ 1,613	1,631
3.500% notes due August 2039 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.50%
Par Value	$ 1,250	1,250
Carrying Value, Noncurrent	1,241	1,241
Fair Value	$ 1,348	1,313
5.700% notes due October 2040 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.70%
Par Value	$ 300	300
Carrying Value, Noncurrent	296	296
Fair Value	$ 405	396
5.950% notes due February 2041 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.95%
Par Value	$ 350	350
Carrying Value, Noncurrent	345	345
Fair Value	$ 484	475
4.625% notes due November 2041 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.625%
Par Value	$ 600	600
Carrying Value, Noncurrent	589	589
Fair Value	$ 742	716
4.375% notes due March 2042 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.375%
Par Value	$ 502	502
Carrying Value, Noncurrent	484	484
Fair Value	$ 601	580
3.950% notes due October 2042 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.95%
Par Value	$ 625	625
Carrying Value, Noncurrent	608	607
Fair Value	$ 711	688
4.250% notes due March 2043 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.25%
Par Value	$ 750	750
Carrying Value, Noncurrent	735	735
Fair Value	$ 885	856
4.750% notes due July 2045 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.75%
Par Value	$ 2,000	2,000
Carrying Value, Noncurrent	1,973	1,973
Fair Value	$ 2,547	2,463
4.200% notes due January 2047 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.20%
Par Value	$ 750	750
Carrying Value, Noncurrent	738	738
Fair Value	$ 881	861
4.250% notes due April 2047 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.25%
Par Value	$ 725	725
Carrying Value, Noncurrent	717	717
Fair Value	$ 853	839
3.750% notes due October 2047 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.75%
Par Value	$ 950	950
Carrying Value, Noncurrent	934	934
Fair Value	$ 1,050	1,023
4.250% notes due June 2048 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.25%
Par Value	$ 1,350	1,350
Carrying Value, Noncurrent	1,330	1,330
Fair Value	$ 1,592	1,569
4.450% notes due December 2048 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.45%
Par Value	$ 1,100	1,100
Carrying Value, Noncurrent	1,086	1,086
Fair Value	$ 1,333	1,316
3.700% notes due August 2049 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.70%
Par Value	$ 1,250	1,250
Carrying Value, Noncurrent	1,235	1,235
Fair Value	$ 1,385	1,344
3.875% notes due August 2059 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.875%
Par Value	$ 1,250	1,250
Carrying Value, Noncurrent	1,229	1,228
Fair Value	$ 1,372	$ 1,350

Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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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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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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Represents the aggregate of total long-term debt, including current maturities and short-term debt.

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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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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Carrying value as of the balance sheet date of the portion of long-term, uncollateralized debt obligations due within one year or the normal operating cycle, if longer.

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Carrying value as of the balance sheet date of uncollateralized debt obligation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

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