Long-Term Debt Long Term Debt (Junior Subordinated Debt and Interest Rates) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Junior subordinated debentures	$ 1,145	$ 756
Junior subordinated debentures
Debt Instrument [Line Items]
Junior subordinated debentures	$ 1,180
Junior subordinated debentures \| 5.25% junior subordinated debentures due 2062
Debt Instrument [Line Items]
Interest Rate	5.25%
Junior subordinated debentures	$ 200
Junior subordinated debentures \| May 5.375% junior subordinated debentures maturing in 2076
Debt Instrument [Line Items]
Interest Rate	5.375%
Junior subordinated debentures	$ 300
Junior subordinated debentures \| 6% junior subordinated debentures maturing 2076
Debt Instrument [Line Items]
Interest Rate	6.00%
Junior subordinated debentures	$ 280
Junior subordinated debentures \| 5.25% junior subordinated debentures due 2077
Debt Instrument [Line Items]
Interest Rate	5.25%
Junior subordinated debentures	$ 400

Contractual interest rate for funds borrowed, under the debt agreement.

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

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+ References

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- Definition

Carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Junior Subordinated Notes, which have a lower priority than senior instruments, excluding current portion.

+ 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)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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