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Unsecured Debt - Senior Unsecured Notes (Details) - USD ($) | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Apr. 30, 2017 | Apr. 30, 2014 | Apr. 30, 2013 | Sep. 30, 2012
--- | --- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount | $ 3,200,000,000 |  | $ 2,900,000,000 |  |  |  |
Unsecured Bonds 5.200% [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount | $ 300,000,000 |  | 300,000,000 |  |  |  |
Unsecured Bonds 5.200% [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate, stated percentage | 5.20% |  |  |  |  |  |
Unsecured Bonds 3.625% [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount | $ 300,000,000 |  | 300,000,000 |  |  |  |
Unsecured Bonds 3.625% [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate, stated percentage | 3.625% |  |  |  |  |  | 3.625%
Unsecured Bonds 3.375% [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount | $ 300,000,000 |  | 300,000,000 |  |  |  |
Unsecured Bonds 3.375% [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate, stated percentage | 3.375% |  |  |  |  |  |
Unsecured Bonds 3.250% [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount | $ 300,000,000 |  | 300,000,000 |  |  |  |
Unsecured Bonds 3.250% [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate, stated percentage | 3.25% |  |  |  |  | 3.25% |
Unsecured Bonds 3.875% [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount | $ 400,000,000 |  | 400,000,000 |  |  |  |
Unsecured Bonds 3.875% [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 400,000,000 |  |
Interest rate, stated percentage | 3.875% |  |  |  | 3.875% |  |
Unsecured Bonds 3.500% [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount | $ 500,000,000 |  | 500,000,000 |  |  |  |
Unsecured Bonds 3.500% [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate, stated percentage | 3.50% |  |  |  |  |  |
Unsecured Bonds 3.375% [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount | $ 450,000,000 |  | 450,000,000 |  |  |  |
Unsecured Bonds 3.375% [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate, stated percentage | 3.375% |  |  |  |  |  |
Unsecured Bonds 3.625% [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount | $ 350,000,000 |  | 350,000,000 |  |  |  |
Unsecured Bonds 3.625% [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 350,000,000 |  |  |
Interest rate, stated percentage | 3.625% |  |  |  |  |  |
Unsecured Bonds 4.500% [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount | $ 300,000,000 |  | $ 0 |  |  |  |
Unsecured Bonds 4.500% [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 300,000,000.0 |  |  |  |  |
Interest rate, stated percentage | 4.50% | 4.50% |  |  |  |  |

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