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Short-Term and Long-Term Debt (Schedule Of Debt) (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Apr. 30, 2016
Debt Instrument [Line Items] |  |  |  |  |
Current maturities of long-term debt |  | $ 450 |  |  |
Total short-term debt |  | 450 |  |  |
Total long-term debt |  | $ 4,894 |  | $ 5,345 |
Fixed rate, swap |  | 5.00% |  |  |
Long-term Debt [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior Long Term Notes |  | $ 3,460 |  | 3,910 |
Capital Securities |  | 1,213 |  | 1,213 |
Unamortized premiums (discounts) |  | (8) |  | (9) |
Unamortized debt issuance costs |  | (25) |  | (27) |
Fair value hedge - interest rate swap agreements |  | 254 |  | 258 |
Total unamortized premiums (discounts), unamortized debt issuance costs and fair value hedges on interest rate swap agreements |  | 221 |  | 222 |
Total long-term debt |  | 4,894 |  | 5,345 |
Parent Company [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total short-term debt |  | 450 |  |  |
Total long-term debt |  | $ 4,894 |  | 5,343 |
7.00% notes, due 2018 [Member] | Long-term Debt [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior Long Term Notes |  |  |  | 200 |
Interest rate |  | 7.00% |  |  |
LIBOR plus 110 bps loan, due 2018 [Member] | Long-term Debt [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior Long Term Notes |  |  |  | 250 |
Variable rate |  | 1.10% |  |  |
8.75% notes, due 2019 [Member] | Long-term Debt [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior Long Term Notes | [1] | $ 287 |  | 287 |
Interest rate | [1] | 8.75% |  |  |
6.25% notes, due 2020 [Member] | Long-term Debt [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior Long Term Notes | [1] | $ 300 |  | 300 |
Interest rate | [1] | 6.25% |  |  |
4.85% notes, due 2021 [Member] | Long-term Debt [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior Long Term Notes | [1] | $ 300 |  | 300 |
Interest rate | [1] | 4.85% |  |  |
4.20% notes, due 2022 [Member] | Long-term Debt [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior Long Term Notes | [1] | $ 300 |  | 300 |
Interest rate | [1] | 4.20% |  |  |
4.00% notes, due 2023 [Member] | Long-term Debt [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior Long Term Notes | [1] | $ 350 |  | 350 |
Interest rate | [1] | 4.00% |  |  |
3.35% notes, due 2025 [Member] | Long-term Debt [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior Long Term Notes | [1] | $ 300 |  | 300 |
Interest rate | [1] | 3.35% |  |  |
3.63% notes, due 2026 [Member] | Long-term Debt [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior Long Term Notes | [1] | $ 400 |  | 400 |
Interest rate | [1] | 3.63% |  |  |
6.15% notes, due 2036 [Member] | Long-term Debt [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior Long Term Notes | [1] | $ 348 |  | 348 |
Interest rate | [1] | 6.15% |  |  |
6.30% notes, due 2037 [Member] | Long-term Debt [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior Long Term Notes | [1],[2] | $ 375 |  | 375 |
Interest rate | [1],[2] | 6.30% |  |  |
7.00% notes, due 2040 [Member] | Long-term Debt [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior Long Term Notes | [1],[2] | $ 500 |  | 500 |
Interest rate | [1],[2] | 7.00% |  |  |
LIBOR +236 bps, due 2066 [Member] | Long-term Debt [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Capital Securities | [3] | $ 722 |  | 722 |
Interest rate |  |  |  |  | 7.00%
Variable rate | [3] | 2.36% |  |  |
LIBOR +204 bps, due 2067 [Member] | Long-term Debt [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Capital Securities | [3] | $ 491 |  | $ 491 |
Interest rate |  |  | 6.05% |  |
Variable rate | [3] | 2.04% |  |  |
[1] | We have the option to repurchase the outstanding notes by paying the greater of 100% of the principal amount of the notes to be redeemed or the make-whole amount (as defined in each note agreement), plus in each case any accrued and unpaid interest as of the date of redemption.Categorized as operating debt for leverage ratio calculations as the proceeds were used as a long-term structured solution to reduce the strain on increasing statutory reserves associated with secondary guarantee UL and term policies.In May 2016, the capital securities due 2066 changed from a 7.00% fixed rate to a floating rate of LIBOR + 236 bps. In April 2017, the capital securities due 2067 changed from a 6.05% fixed rate to a floating rate of LIBOR + 204 bps. To hedge the variability in rates, we purchased forward starting swaps to lock in a fixed rate of approximately 5% over the remaining terms of the capital securities, respectively.
[2] | Categorized as operating debt for leverage ratio calculations as the proceeds were used as a long-term structured solution to reduce the strain on increasing statutory reserves associated with secondary guarantee UL and term policies.
[3] | In May 2016, the capital securities due 2066 changed from a 7.00% fixed rate to a floating rate of LIBOR + 236 bps. In April 2017, the capital securities due 2067 changed from a 6.05% fixed rate to a floating rate of LIBOR + 204 bps. To hedge the variability in rates, we purchased forward starting swaps to lock in a fixed rate of approximately 5% over the remaining terms of the capital securities, respectively.

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- Definition The fair value hedge associated with forward based contracts on certain long-term debt agreements in which two parties agree to swap periodic payments that are fixed at the outset of the swap contract with variable payments based on a market interest rate (index rate) over a specified period. + References No definition available. + Details
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- Definition Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer. + 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 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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