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v3.20.4

Unsecured Debt - Senior Unsecured Notes (Details) - USD ($) | Dec. 31, 2020 | Aug. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2019 | Oct. 31, 2019 | Aug. 31, 2019 | Mar. 31, 2019 | Feb. 28, 2019 | Mar. 31, 2018 | Apr. 30, 2017 | Apr. 30, 2014 | Apr. 30, 2013
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Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount | $ 4,900,000,000 |  |  | $ 4,250,000,000 |  |  |  |  |  |  |  |
Unsecured Bonds 5.200% |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount | $ 0 |  |  | 300,000,000 |  |  |  |  |  |  |  |
Unsecured Bonds 5.200% | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Coupon Rate | 5.20% |  |  |  |  |  |  |  |  |  |  |
Unsecured Bonds 3.625% |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount | $ 0 |  |  | 300,000,000 |  |  |  |  |  |  |  |
Unsecured Bonds 3.625% | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  | $ 300,000,000.0 |  |  |  |  |  |  |  |  |  |
Coupon Rate | 3.625% | 3.625% |  |  |  |  |  |  |  |  |  |
Unsecured Bonds 3.375% |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount | $ 300,000,000 |  |  | 300,000,000 |  |  |  |  |  |  |  |
Unsecured Bonds 3.375% | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Coupon Rate | 3.375% |  |  |  |  |  |  |  |  |  |  |
Unsecured Bonds 3.250% |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount | $ 300,000,000 |  |  | 300,000,000 |  |  |  |  |  |  |  |
Unsecured Bonds 3.250% | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Coupon Rate | 3.25% |  |  |  |  |  |  |  |  |  |  | 3.25%
Unsecured Bonds 3.875% |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount | $ 400,000,000 |  |  | 400,000,000 |  |  |  |  |  |  |  |
Unsecured Bonds 3.875% | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  |  |  |  |  |  | $ 400,000,000.0 |
Coupon Rate | 3.875% |  |  |  |  |  |  |  |  |  | 3.875% |
Unsecured Bonds 3.500% |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount | $ 500,000,000 |  |  | 500,000,000 |  |  |  |  |  |  |  |
Unsecured Bonds 3.500% | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Coupon Rate | 3.50% |  |  |  |  |  |  |  |  |  |  |
Unsecured Bonds 3.375% |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount | $ 450,000,000.0 |  |  | 450,000,000 |  |  |  |  |  |  |  |
Unsecured Bonds 3.375% | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Coupon Rate | 3.375% |  |  |  |  |  |  |  |  |  |  |
Unsecured Bonds 3.625% |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount | $ 350,000,000 |  |  | 350,000,000 |  |  |  |  |  |  |  |
Unsecured Bonds 3.625% | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  |  |  |  |  | $ 350,000,000.0 |  |
Coupon Rate | 3.625% |  |  |  |  |  |  |  |  |  |  |
Unsecured Bonds 4.000% |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount | $ 500,000,000 |  |  | 500,000,000 |  |  |  |  |  |  |  |
Unsecured Bonds 4.000% | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  |  | $ 150,000,000.0 | $ 350,000,000.0 |  |  |  |
Coupon Rate | 4.00% |  |  |  |  |  |  | 4.00% |  |  |  |
Unsecured Bonds 3.000% |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount | $ 550,000,000 |  |  | 550,000,000 |  |  |  |  |  |  |  |
Unsecured Bonds 3.000% | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  | $ 150,000,000.0 | $ 400,000,000.0 |  |  |  |  |  |
Coupon Rate | 3.00% |  |  |  |  | 3.00% |  |  |  |  |  |
Unsecured Bonds 1.650% |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount | $ 300,000,000 |  |  | 0 |  |  |  |  |  |  |  |
Unsecured Bonds 1.650% | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Coupon Rate | 1.65% |  |  |  |  |  |  |  |  |  |  |
Unsecured Bonds 2.650% |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount | $ 650,000,000 |  |  | 0 |  |  |  |  |  |  |  |
Unsecured Bonds 2.650% | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  | $ 150,000,000.0 |  |  |  |  |  |  |  |  |
Coupon Rate | 2.65% |  |  |  |  |  |  |  |  |  |  |
Unsecured Bonds 4.500% |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount | $ 300,000,000 |  |  | 300,000,000 |  |  |  |  |  |  |  |
Unsecured Bonds 4.500% | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  |  |  |  | $ 300,000,000.0 |  |  |
Coupon Rate | 4.50% |  |  |  |  |  |  |  | 4.50% |  |  |
Unsecured Bonds 2.650% |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount | $ 300,000,000 |  |  | $ 0 |  |  |  |  |  |  |  |
Unsecured Bonds 2.650% | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Coupon Rate | 2.65% |  |  |  |  |  |  |  |  |  |  |

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