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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
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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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