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Unsecured Debt - Senior Unsecured Notes (Details) - USD ($) | Dec. 31, 2016 | Dec. 31, 2015 | Apr. 01, 2014 | Apr. 30, 2013 | Sep. 30, 2012
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Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, face amount | $ 2,850,000,000 | $ 2,400,000,000 |  |  |
Unsecured Bonds 5.500% [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, face amount | $ 300,000,000 | 300,000,000 |  |  |
Unsecured Bonds 5.500% [Member] | Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate, stated percentage | 5.50% |  |  |  |
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 3.25% [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, face amount | $ 300,000,000 | 300,000,000 |  |  |
Unsecured Bonds 3.25% [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 |  |  | $ 400,000,000.0 |  |
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 | $ 0 |  |  |
Unsecured Bonds 3.375% [Member] | Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate, stated percentage | 3.375% |  |  |  |

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