Debt Narrative (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 9,825
Proceeds from Debt, Net of Issuance Costs	9,780
Repayments of Debt	$ 9,847	$ 5,854
One Point One Six Seven Percent due February 4, 2023 [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date	Feb. 04, 2023
Debt Instrument, Interest Rate, Stated Percentage	1.167%
Debt Instrument, Face Amount	$ 1,325
One Point Four Three Three Percent due February 4, 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date	Feb. 04, 2024
Debt Instrument, Interest Rate, Stated Percentage	1.433%
Debt Instrument, Face Amount	$ 3,000
Two Point One Nine Six Percent due February 4, 2026 [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date	Feb. 04, 2026
Debt Instrument, Interest Rate, Stated Percentage	2.196%
Debt Instrument, Face Amount	$ 5,500
Delayed Draw Term Loan Facility
Debt Instrument [Line Items]
Repayments of Debt	9,825
Line of Credit Facility, Remaining Borrowing Capacity	4,000
Revolving Credit Facility
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	14,753
Three Hundred And Sixty Four Day Revolving Credit Facility
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	3,073
Two Year Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	5,280
Three Year Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	3,200
Five Year Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 3,200

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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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.

+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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