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=34725769&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
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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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- References

No definition available.

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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

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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
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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).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Debt, Non-Bank Debt (Details) - USD ($)	12 Months Ended
Debt, Non-Bank Debt (Details) - USD ($)	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