Debt - Long-Term Debt Obligations (Details) - USD ($)	3 Months Ended
Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Face value of long-term debt	$ 33,227,000,000	$ 33,174,000,000
Less current portion of long-term debt	(1,156,000,000)	(1,155,000,000)
Long-term debt	31,868,000,000	31,816,000,000
Senior Notes
Debt Instrument [Line Items]
Face value of long-term debt		32,200,000,000
Unamortized discount and issuance costs, net	$ (203,000,000)	(203,000,000)
Weighted average remaining lives term	15 years 6 months
Senior Notes \| 2012 Notes issuance of $3.0 billion
Debt Instrument [Line Items]
Issuance amount	$ 3,000,000,000.0
Stated Interest Rates	2.50%
Effective Interest Rates	2.66%
Face value of long-term debt	$ 1,250,000,000	1,250,000,000
Weighted average remaining lives term	1 year 8 months 12 days
Senior Notes \| 2014 Notes issuance of $6.0 billion
Debt Instrument [Line Items]
Issuance amount	$ 6,000,000,000.0
Face value of long-term debt	$ 5,000,000,000	5,000,000,000
Weighted average remaining lives term	11 years 7 months 6 days
Senior Notes \| 2014 Notes issuance of $6.0 billion \| Minimum
Debt Instrument [Line Items]
Stated Interest Rates	3.30%
Effective Interest Rates	3.43%
Senior Notes \| 2014 Notes issuance of $6.0 billion \| Maximum
Debt Instrument [Line Items]
Stated Interest Rates	4.95%
Effective Interest Rates	5.11%
Senior Notes \| 2017 Notes issuance of $17.0 billion
Debt Instrument [Line Items]
Issuance amount	$ 17,000,000,000.0
Face value of long-term debt	$ 16,000,000,000	16,000,000,000
Weighted average remaining lives term	16 years
Senior Notes \| 2017 Notes issuance of $17.0 billion \| Minimum
Debt Instrument [Line Items]
Stated Interest Rates	2.40%
Effective Interest Rates	2.56%
Senior Notes \| 2017 Notes issuance of $17.0 billion \| Maximum
Debt Instrument [Line Items]
Stated Interest Rates	5.20%
Effective Interest Rates	4.33%
Senior Notes \| 2020 Notes issuance of $10.0 billion
Debt Instrument [Line Items]
Issuance amount	$ 10,000,000,000.0
Face value of long-term debt	$ 10,000,000,000	10,000,000,000
Weighted average remaining lives term	18 years 6 months
Senior Notes \| 2020 Notes issuance of $10.0 billion \| Minimum
Debt Instrument [Line Items]
Stated Interest Rates	0.40%
Effective Interest Rates	0.56%
Senior Notes \| 2020 Notes issuance of $10.0 billion \| Maximum
Debt Instrument [Line Items]
Stated Interest Rates	2.70%
Effective Interest Rates	2.77%
Credit Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Face value of long-term debt	$ 429,000,000	338,000,000
Other long-term debt
Debt Instrument [Line Items]
Face value of long-term debt	$ 548,000,000	$ 586,000,000

Debt Instrument, Weighted Average Remaining Lives Term

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- Definition

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

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

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

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