v3.8.0.1

Short-Term and Long-Term Debt (Schedule of Junior Subordinated Notes) (Details) | 12 Months Ended
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Dec. 31, 2017 USD ($)
Junior Subordinated Institutional Notes June 2008 |
Debt Instrument [Line Items] |
Principal Amount | $ 600,000,000
Interest Rate | 8.88%
Interest Rate Subsequent to Optional Redemption Date | 5.00%
Junior Subordinated Institutional Notes August 2012 |
Debt Instrument [Line Items] |
Principal Amount | $ 1,000,000,000
Interest Rate | 5.88%
Interest Rate Subsequent to Optional Redemption Date | 4.18%
Junior Subordinated Institutional Notes November 2012 |
Debt Instrument [Line Items] |
Principal Amount | $ 1,500,000,000
Interest Rate | 5.63%
Interest Rate Subsequent to Optional Redemption Date | 3.92%
Junior Subordinated Retail Notes December 2012 |
Debt Instrument [Line Items] |
Principal Amount | $ 575,000,000
Interest Rate | 5.75%
Junior Subordinated Retail Notes March 2013 |
Debt Instrument [Line Items] |
Principal Amount | $ 710,000,000
Interest Rate | 5.70%
Junior Subordinated Institutional Notes March 2013 |
Debt Instrument [Line Items] |
Principal Amount | $ 500,000,000
Interest Rate | 5.20%
Interest Rate Subsequent to Optional Redemption Date | 3.04%
Junior Subordinated Institutional Notes May 2015 |
Debt Instrument [Line Items] |
Principal Amount | $ 1,000,000,000
Interest Rate | 5.38%
Interest Rate Subsequent to Optional Redemption Date | 3.03%
Junior Subordinated Institutional Notes September 2017 [Member] [Member] |
Debt Instrument [Line Items] |
Principal Amount | $ 750,000,000
Interest Rate | 4.50%
Interest Rate Subsequent to Optional Redemption Date | 2.38%

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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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