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Debt (Junior Subordinated Notes) (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) entity | Dec. 31, 2015 USD ($)
Debt Instrument [Line Items] |  |
Long-term Debt | $ 27,716,999,000 | $ 29,641,863,000
Subordinated Debt [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt | 1,555,548,000 | 1,564,045,000
Junior Subordinated Notes [Member] | Subordinated Debt [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt | 500,000,000 | $ 500,000,000
Face amount | $ 500,000,000 |
Debt, fixed interest rate | 6.50% |
Applicable Margin | 4.30% |
Deferral of interest payments, maximum term | 5 years |
Junior Subordinated Notes [Member] | Subordinated Debt [Member] | Debt Instrument, Redemption, Option (i) [Member] |  |
Debt Instrument [Line Items] |  |
Redemption price of debt instrument, percentage | 100.00% |
Junior Subordinated Notes [Member] | Subordinated Debt [Member] | Debt Instrument, Redemption, Option (iii) [Member] |  |
Debt Instrument [Line Items] |  |
Redemption price of debt instrument, percentage | 100.00% |
Junior Subordinated Notes [Member] | Subordinated Debt [Member] | Debt Instrument, Redemption, Option (iv) [Member] |  |
Debt Instrument [Line Items] |  |
Redemption price of debt instrument, percentage | 101.00% |
Days after occurence | 60 days |
Number Of Applicable Rating Agencies | entity | 2 |
Annual interest rate increase | 5.00% |
Revolving Credit Facility Before Issuance Of Junior Subondinated Notes [Member] |  |
Debt Instrument [Line Items] |  |
Credit facility, current borrowing capacity | $ 1,000,000,000 |
Revolving Credit Facility After Issuance Of Junior Subondinated Notes [Member] |  |
Debt Instrument [Line Items] |  |
Credit facility, current borrowing capacity | $ 500,000,000 |

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