Face (par) amount of debt instrument at time of issuance.

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

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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))
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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))
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- Definition

Percentage of principal amount of debt redeemed.

+ References

No definition available.

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- References

No definition available.

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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

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- Definition

The cash outflow for the extinguishment of long-term borrowing, with the highest claim on the assets of the entity in case of bankruptcy or liquidation, before its maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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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
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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
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Debt, Non-Bank Debt (Details) - USD ($)	12 Months Ended
Debt, Non-Bank Debt (Details) - USD ($)	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
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 in percentage	3.40%
Maturity date of long-term debt issuance	Sep. 15, 2026
Proceeds from issuance of senior long-term debt	$ 1,246,000,000
Debt issuance costs	$ 10,000,000
Senior Notes [Member] \| Senior Notes Due in June 2017 [Member]
Non-Bank Debt (Textual)
Interest rate of notes in percentage	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	103.70%
Senior Notes [Member] \| Senior Notes Due in October 2017 [Member]
Non-Bank Debt (Textual)
Interest rate of notes in percentage	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	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 in percentage	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 in percentage	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 in percentage	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 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
Debentures [Member] \| Debenture Due In 2015 [Member]
Non-Bank Debt (Textual)
Interest rate of notes in percentage		8.75%
Debt repayments		$ 75,000,000