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Debt, Non-Bank Debt (Details) - USD ($) | 6 Months Ended
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Jun. 30, 2016 | Jun. 30, 2015
Issued Debt [Member] |  |
Non-Bank Debt (Textual) |  |
Borrowings on non-bank debt | $ 0 |
Repayments of non-bank debt | $ 0 |
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
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=64930739&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=64930785&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=66902209&loc=d3e3291-108585 + Details
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- Definition The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt. + References No definition available. + 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=66902209&loc=d3e3255-108585 + Details
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- Definition Amount of cash outflow for the payment of debt classified as other, maturing after one year or 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=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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