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Debt - Debt (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 29, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jul. 19, 2018 | Jun. 15, 2018 | Mar. 15, 2018
Debt Instruments [Line Items] |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  | $ 500,000,000
Proceeds from Debt, Net of Issuance Costs |  |  |  | $ 490,000,000 |  |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed |  |  |  | 100.00% |  |  |  |
Debt Instrument, Interest Rate, Increase (Decrease) |  |  |  | 25.00% |  |  |  |
Gain (Loss) on Extinguishment of Debt |  | $ 0 | $ 0 | $ (6,000,000) | $ 0 |  |  |
Line of Credit Facility, Covenant Terms - Monetary | $ 9,000,000,000 |  |  |  |  |  |  |
Letters of Credit, Maximum Borrowing Capacity |  | 100,000,000 |  | 100,000,000 |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  | 0 |  | 0 |  |  |  |
Commercial Paper |  | 0 |  | 0 |  |  |  |
Letters of Credit Outstanding, Amount |  | 3,000,000 |  | 3,000,000 |  |  |  |
Federal Home Loan Bank, Advances, Affordable Housing Program, Principal Outstanding |  | 0 |  | 0 |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Amount Outstanding During Period |  |  |  | $ 750,000,000 |  |  |  |
Line of Credit Facility, Covenant Terms - Percent |  |  |  | 35.00% |  |  |  |
Revolving Credit Facility | Scenario, Adjustment [Member] |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 1,000,000,000 |  | $ 1,000,000,000 |  |  |  |
Commercial Paper [Member] |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  | $ 750 |  |
Commercial Paper [Member] | Scenario, Adjustment [Member] |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 1,000,000,000 |  | 1,000,000,000 |  |  |  |
Previously Reported [Member] |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Covenant Terms - Monetary |  |  |  | 13,500,000,000 |  |  |  |
Letters of Credit, Maximum Borrowing Capacity |  | 250,000,000 |  | $ 250,000,000 |  |  |  |
4.4% Notes, due 2048 |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  | 4.40%
6.3% Notes, due 2018 | Senior Notes |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  | 6.30%
Repayment of debt |  |  |  |  |  |  |  | $ 320,000,000
8.125% Notes, due 2068 |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 8.125% |
Debt Instrument, Face Amount |  |  |  |  |  |  | $ 500,000,000 |
3 month Libor 2.125% Notes due 2067 | LIBOR |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |
Variable Interest Rate |  |  |  | 2.125% |  |  |  |
Hartford Fire Insurance Company [Member] |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances |  | 1,300,000,000 |  | $ 1,300,000,000 |  |  |  |
Hartford Life and Accident Insurance Company [Member] |  |  |  |  |  |  |  |
Debt Instruments [Line Items] |  |  |  |  |  |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances |  | $ 500,000,000 |  | $ 500,000,000 |  |  |  |

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- Definition Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)(2)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(a)(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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