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Fair Value (Details) - Senior notes - USD ($)	Dec. 31, 2020	Sep. 01, 2020	Jun. 22, 2020	Aug. 26, 2019	Aug. 28, 2018	Dec. 19, 2016	Dec. 07, 2015	Nov. 21, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Face amount of debt	$ 8,000,000,000
$500 2.800% senior notes due 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Face amount of debt						$ 500,000,000.0
Interest rate						2.80%
$500 2.800% senior notes due 2021 | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Face amount of debt	500,000,000
Fair value of debt	$ 511,000,000
Interest rate	2.80%
$500 3.125% senior notes due 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Face amount of debt								$ 500,000,000.0
Interest rate								3.125%
$500 3.125% senior notes due 2022 | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Face amount of debt	$ 500,000,000
Fair value of debt	$ 523,000,000
Interest rate	3.125%
$300 0.450% senior notes due 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Face amount of debt		$ 300,000,000.0
Interest rate		0.45%
$300 0.450% senior notes due 2022 | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Face amount of debt	$ 300,000,000
Fair value of debt	$ 301,000,000
Interest rate	0.45%
$700 3.650% senior notes due 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Face amount of debt					$ 700,000,000.0
Interest rate					3.65%
$700 3.650% senior notes due 2023 | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Face amount of debt	$ 700,000,000
Fair value of debt	$ 759,000,000
Interest rate	3.65%
$500 2.350% senior notes due 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Face amount of debt				$ 500,000,000.0
Interest rate				2.35%
$500 2.350% senior notes due 2024 | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Face amount of debt	$ 500,000,000
Fair value of debt	$ 533,000,000
Interest rate	2.35%
$300 3.850% senior notes due 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Face amount of debt							$ 300,000,000.0
Interest rate							3.85%
$300 3.850% senior notes due 2025 | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Face amount of debt	$ 300,000,000
Fair value of debt	$ 340,000,000
Interest rate	3.85%
$700 1.000% senior notes due 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Face amount of debt		$ 700,000,000.0
Interest rate		1.00%
$700 1.000% senior notes due 2025 | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Face amount of debt	$ 700,000,000
Fair value of debt	$ 709,000,000
Interest rate	1.00%
$700 3.800% senior notes due 2026
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Face amount of debt						$ 700,000,000.0
Interest rate						3.80%
$700 3.800% senior notes due 2026 | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Face amount of debt	$ 700,000,000
Fair value of debt	$ 810,000,000
Interest rate	3.80%
$700 1.400% senior notes due 2027
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Face amount of debt		$ 700,000,000.0
Interest rate		1.40%
$700 1.400% senior notes due 2027 | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Face amount of debt	$ 700,000,000
Fair value of debt	$ 710,000,000
Interest rate	1.40%
$800 4.200% senior notes due 2028
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Face amount of debt					$ 800,000,000.0
Interest rate					4.20%
$800 4.200% senior notes due 2028 | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Face amount of debt	$ 800,000,000
Fair value of debt	$ 956,000,000
Interest rate	4.20%
$700 2.950% senior notes due 2029
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Face amount of debt				$ 700,000,000.0
Interest rate				2.95%
$700 2.950% senior notes due 2029 | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Face amount of debt	$ 700,000,000
Fair value of debt	$ 771,000,000
Interest rate	2.95%
$600 2.000% senior notes due 2030
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Face amount of debt			$ 600,000,000.0
Interest rate			2.00%
$600 2.000% senior notes due 2030 | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Face amount of debt	$ 600,000,000
Fair value of debt	$ 616,000,000
Interest rate	2.00%
$1,000 1.750% senior notes due 2031
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Face amount of debt		$ 1,000,000,000.0
Interest rate		1.75%
$1,000 1.750% senior notes due 2031 | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Face amount of debt	$ 1,000,000,000
Fair value of debt	$ 996,000,000
Interest rate	1.75%

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- Definition

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

+ References

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

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