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Debt, Non-Bank Debt (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Senior Notes [Member] |  |  |
Non-Bank Debt (Textual) |  |  |
Proceeds from issuance of senior long-term debt | $ 1,246,000,000 |  |
Debt issuance costs | 12,000,000 |  |
Senior Notes [Member] | Senior Notes Due in 2025 [Member] |  |  |
Non-Bank Debt (Textual) |  |  |
Face amount of long-term debt issuance | $ 600,000,000 |  |
Interest rate of notes in percentage | 3.65% |  |
Maturity date of long-term debt issuance | Mar. 15, 2025 |  |
Senior Notes [Member] | Senior Notes Due in 2045 [Member] |  |  |
Non-Bank Debt (Textual) |  |  |
Face amount of long-term debt issuance | $ 650,000,000 |  |
Interest rate of notes in percentage | 4.90% |  |
Maturity date of long-term debt issuance | Mar. 15, 2045 |  |
Senior Notes [Member] | Senior Notes Due In 2015 [Member] |  |  |
Non-Bank Debt (Textual) |  |  |
Interest rate of notes in percentage | 4.50% |  |
Debt repayments | $ 400,000,000 |  |
Senior Notes [Member] | Senior Notes Due In 2014 [Member] |  |  |
Non-Bank Debt (Textual) |  |  |
Interest rate of notes in percentage |  | 4.75% |
Debt repayments |  | $ 200,000,000 |
Senior Notes [Member] | Senior Notes Due In January 2013 [Member] |  |  |
Non-Bank Debt (Textual) |  |  |
Interest rate of notes in percentage |  |  | 6.70%
Debt repayments |  |  | $ 180,000,000
Senior Notes [Member] | Senior Notes Due In June 2013 [Member] |  |  |
Non-Bank Debt (Textual) |  |  |
Interest rate of notes in percentage |  |  | 4.75%
Debt repayments |  |  | $ 300,000,000
Debentures [Member] | Debenture Due In 2015 [Member] |  |  |
Non-Bank Debt (Textual) |  |  |
Interest rate of notes in percentage | 8.75% |  |
Debt repayments | $ 75,000,000 |  |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 + Details
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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 Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + 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)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt. + 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 (e) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 + Details
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- Definition The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer). + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585 + Details
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- Definition The cash outflow attributable to repayments of borrowings not otherwise defined in the taxonomy (with maturities initially due after one year or beyond the 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=56944662&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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