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Long-Term Debt - Debt Issuance, Repurchases, Repayments and Exchanges (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2021	Mar. 31, 2021	Jul. 31, 2021
Variable rate bonds due 2021 | First Quarter Repayments
Long-term Debt Rollforward [Roll Forward]
Payments		$ (27)
Senior Notes | Third Quarter Repayments
Long-term Debt Rollforward [Roll Forward]
Payments	$ (4,475)
Senior Notes | 4.850% senior notes due 2021 | First Quarter Repayments
Long-term Debt Rollforward [Roll Forward]
Interest rate		4.85%
Payments		$ (147)
Senior Notes | 2.700% senior notes due 2022 | Third Quarter Repayments
Long-term Debt Rollforward [Roll Forward]
Interest rate			0.027%
Payments	(278)
Senior Notes | 2.700% senior notes due 2023 | Third Quarter Repayments
Long-term Debt Rollforward [Roll Forward]
Interest rate			0.027%
Payments	(484)
Senior Notes | 3.450% senior notes due 2024 | Third Quarter Repayments
Long-term Debt Rollforward [Roll Forward]
Interest rate			0.0345%
Payments	(81)
Senior Notes | 2.900% senior notes due 2024 | Third Quarter Repayments
Long-term Debt Rollforward [Roll Forward]
Interest rate			0.029%
Payments	(1,620)
Senior Notes | 3.500% senior notes due 2025 | Third Quarter Repayments
Long-term Debt Rollforward [Roll Forward]
Interest rate			0.035%
Payments	(229)
Senior Notes | 3.400% senior notes due 2026 | Third Quarter Repayments
Long-term Debt Rollforward [Roll Forward]
Interest rate			0.034%
Payments	(224)
Senior Notes | 3.200% senior notes due 2026 | Third Quarter Repayments
Long-term Debt Rollforward [Roll Forward]
Interest rate			0.032%
Payments	(110)
Senior Notes | 2.600% senior notes due 2021 | Third Quarter Repayments
Long-term Debt Rollforward [Roll Forward]
Interest rate			2.60%
Payments	(224)
Senior Notes | Floating interest rate notes due August 2022 | Third Quarter Repayments
Long-term Debt Rollforward [Roll Forward]
Payments	$ (1,051)

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Long-term Debt Rollforward

+ References

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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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
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585

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