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Debt Level 4 (Details) - USD ($) $ in Millions | 3 Months Ended | 119 Months Ended | 600 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Feb. 15, 2027 | Feb. 12, 2067 | Mar. 15, 2017
Debt Instruments [Line Items] |  |  |  |  |
Proceeds from (Repayments of) Debt | $ 500 | $ 0 |  |  |
Repayments of Short-term Debt | $ 416 |  |  |  |
Senior Note Five Point Three Seven Five Due in Two Thousand Seventeen [Member] |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 5.375%
Scenario, Forecast [Member] | Junior Subordinated Notes 3 month Libor plus Two Point One Two Five Percent Due Two Thousand Sixty Seven [Member] |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate Terms |  |  |  | three-month LIBOR plus 2.125% |
Scenario, Forecast [Member] | Junior Subordinated Notes Four Point Three Nine Percent Due Two Thousand Twenty Seven [Member] |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate Terms |  |  | 0.0439 |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The net cash inflow or outflow in aggregate debt due to repayments and proceeds from additional borrowings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The cash outflow for a borrowing having initial term of repayment within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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