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Debt, Non-Bank Debt (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017
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 2026 [Member] |  |  |
Non-Bank Debt (Textual) |  |  |
Face amount of long-term debt issuance | $ 1,250,000,000 |  |
Interest rate of notes (percent) | 3.40% |  | 3.40%
Maturity date of long-term debt issuance | Sep. 15, 2026 |  |
Proceeds from issuance of senior long-term debt | $ 1,246,000,000 |  |
Payments of debt issuance costs | $ 10,000,000 |  |
Senior Notes [Member] | Senior Notes Due in June 2017 [Member] |  |  |
Non-Bank Debt (Textual) |  |  |
Interest rate of notes (percent) | 6.125% |  |
Maturity date of long-term debt issuance | Jun. 15, 2017 |  |
Early repayment of senior debt | $ 778,000,000 |  |
Debt instrument, redemption price, percentage of principal amount redeemed (percent) | 103.70% |  |
Senior Notes [Member] | Senior Notes Due in October 2017 [Member] |  |  |
Non-Bank Debt (Textual) |  |  |
Interest rate of notes (percent) | 7.20% |  |
Maturity date of long-term debt issuance | Oct. 15, 2017 |  |
Early repayment of senior debt | $ 213,000,000 |  |
Debt instrument, redemption price, percentage of principal amount redeemed (percent) | 106.27% |  |
Senior Notes [Member] | VLP Senior Notes Due in 2026 [Member] |  |  |
Non-Bank Debt (Textual) |  |  |
Face amount of long-term debt issuance | $ 500,000,000 |  |
Interest rate of notes (percent) | 4.375% |  | 4.375%
Maturity date of long-term debt issuance | Dec. 15, 2026 |  |
Proceeds from issuance of senior long-term debt | $ 500,000,000 |  |
Debt issuance costs | $ 4,000,000 |  |
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 (percent) |  | 3.65% | 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 (percent) |  | 4.90% | 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 (percent) |  | 4.50% |
Debt repayments |  | $ 400,000,000 |
Debentures [Member] | Debenture Due In 2015 [Member] |  |  |
Non-Bank Debt (Textual) |  |  |
Interest rate of notes (percent) |  | 8.75% |
Debt repayments |  | $ 75,000,000 |

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- Definition Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 + Details
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