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Fair Value Measurements Investment Fair Value (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Mortgage-backed securities: [Abstract] |  |  |
Investments |  | $ 15,351 | $ 14,480
Marketable Securities, Equity Securities [Abstract] |  |  |
Securities sold, not yet purchased, at fair value |  | 794 | 334
Investment Segment [Member] |  |  |
Mortgage-backed securities: [Abstract] |  |  |
Investments |  | 14,553 | 13,941
Marketable Securities, Equity Securities [Abstract] |  |  |
Securities sold, not yet purchased, at fair value |  | 794 | 334
Investment Segment [Member] | Recurring measurement [Member] |  |  |
Mortgage-backed securities: [Abstract] |  |  |
Investments |  | 14,553 | 13,941
Derivative contracts, at fair value(1) | [1] | 214 | 3
Assets, Fair Value Disclosure |  | 14,767 | 13,944
Marketable Securities, Equity Securities [Abstract] |  |  |
Derivative contracts, at fair value(2) | [2] | 33 | 627
Financial and Nonfinancial Liabilities, Fair Value Disclosure |  | 827 | 961
Investment Segment [Member] | Recurring measurement [Member] | Level 1 [Member] |  |  |
Mortgage-backed securities: [Abstract] |  |  |
Investments |  | 14,324 | 13,639
Derivative contracts, at fair value(1) | [1] | 0 | 0
Assets, Fair Value Disclosure |  | 14,324 | 13,639
Marketable Securities, Equity Securities [Abstract] |  |  |
Derivative contracts, at fair value(2) | [2] | 0 | 0
Financial and Nonfinancial Liabilities, Fair Value Disclosure |  | 794 | 334
Investment Segment [Member] | Recurring measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Mortgage-backed securities: [Abstract] |  |  |
Investments |  | 174 | 227
Derivative contracts, at fair value(1) | [1] | 214 | 3
Assets, Fair Value Disclosure |  | 388 | 230
Marketable Securities, Equity Securities [Abstract] |  |  |
Derivative contracts, at fair value(2) | [2] | 33 | 627
Financial and Nonfinancial Liabilities, Fair Value Disclosure |  | 33 | 627
Investment Segment [Member] | Recurring measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Mortgage-backed securities: [Abstract] |  |  |
Investments |  | 55 | 75
Derivative contracts, at fair value(1) | [1] | 0 | 0
Assets, Fair Value Disclosure |  | 55 | 75
Marketable Securities, Equity Securities [Abstract] |  |  |
Derivative contracts, at fair value(2) | [2] | 0 | 0
Financial and Nonfinancial Liabilities, Fair Value Disclosure |  | 0 | 0
Investment Segment [Member] | Equity securities | Recurring measurement [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 14,324 | 13,639
Marketable Securities, Equity Securities [Abstract] |  |  |
Securities sold, not yet purchased, at fair value |  | 794 | 334
Investment Segment [Member] | Equity securities | Recurring measurement [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 14,324 | 13,639
Marketable Securities, Equity Securities [Abstract] |  |  |
Securities sold, not yet purchased, at fair value |  | 794 | 334
Investment Segment [Member] | Equity securities | Recurring measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 0 | 0
Marketable Securities, Equity Securities [Abstract] |  |  |
Securities sold, not yet purchased, at fair value |  | 0 | 0
Investment Segment [Member] | Equity securities | Recurring measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 0 | 0
Marketable Securities, Equity Securities [Abstract] |  |  |
Securities sold, not yet purchased, at fair value |  | 0 | 0
Investment Segment [Member] | Corporate Debt Securities [Member] | Recurring measurement [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 72 | 129
Investment Segment [Member] | Corporate Debt Securities [Member] | Recurring measurement [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 0 | 0
Investment Segment [Member] | Corporate Debt Securities [Member] | Recurring measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 17 | 54
Investment Segment [Member] | Corporate Debt Securities [Member] | Recurring measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 55 | 75
Basic Materials [Member] | Investment Segment [Member] | Equity securities | Recurring measurement [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 563 | 0
Basic Materials [Member] | Investment Segment [Member] | Equity securities | Recurring measurement [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 563 | 0
Basic Materials [Member] | Investment Segment [Member] | Equity securities | Recurring measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 0 | 0
Basic Materials [Member] | Investment Segment [Member] | Equity securities | Recurring measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 0 | 0
Communications [Member] | Investment Segment [Member] | Equity securities | Recurring measurement [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 407 | 2,846
Communications [Member] | Investment Segment [Member] | Equity securities | Recurring measurement [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 407 | 2,846
Communications [Member] | Investment Segment [Member] | Equity securities | Recurring measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 0 | 0
Communications [Member] | Investment Segment [Member] | Equity securities | Recurring measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 0 | 0
Consumer, non-cyclical [Member] | Investment Segment [Member] | Equity securities | Recurring measurement [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 3,684 | 2,308
Marketable Securities, Equity Securities [Abstract] |  |  |
Securities sold, not yet purchased, at fair value |  | 794 | 0
Consumer, non-cyclical [Member] | Investment Segment [Member] | Equity securities | Recurring measurement [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 3,684 | 2,308
Marketable Securities, Equity Securities [Abstract] |  |  |
Securities sold, not yet purchased, at fair value |  | 794 | 0
Consumer, non-cyclical [Member] | Investment Segment [Member] | Equity securities | Recurring measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 0 | 0
Marketable Securities, Equity Securities [Abstract] |  |  |
Securities sold, not yet purchased, at fair value |  | 0 | 0
Consumer, non-cyclical [Member] | Investment Segment [Member] | Equity securities | Recurring measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 0 | 0
Marketable Securities, Equity Securities [Abstract] |  |  |
Securities sold, not yet purchased, at fair value |  | 0 | 0
Consumer, cyclical [Member] | Investment Segment [Member] | Equity securities | Recurring measurement [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 115 | 436
Marketable Securities, Equity Securities [Abstract] |  |  |
Securities sold, not yet purchased, at fair value |  | 0 | 334
Consumer, cyclical [Member] | Investment Segment [Member] | Equity securities | Recurring measurement [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 115 | 436
Marketable Securities, Equity Securities [Abstract] |  |  |
Securities sold, not yet purchased, at fair value |  | 0 | 334
Consumer, cyclical [Member] | Investment Segment [Member] | Equity securities | Recurring measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 0 | 0
Marketable Securities, Equity Securities [Abstract] |  |  |
Securities sold, not yet purchased, at fair value |  | 0 | 0
Consumer, cyclical [Member] | Investment Segment [Member] | Equity securities | Recurring measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 0 | 0
Marketable Securities, Equity Securities [Abstract] |  |  |
Securities sold, not yet purchased, at fair value |  | 0 | 0
Consumer, cyclical [Member] | Investment Segment [Member] | Corporate Debt Securities [Member] | Recurring measurement [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 55 | 75
Consumer, cyclical [Member] | Investment Segment [Member] | Corporate Debt Securities [Member] | Recurring measurement [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 0 | 0
Consumer, cyclical [Member] | Investment Segment [Member] | Corporate Debt Securities [Member] | Recurring measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 0 | 0
Consumer, cyclical [Member] | Investment Segment [Member] | Corporate Debt Securities [Member] | Recurring measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 55 | 75
Diversified [Member] | Investment Segment [Member] | Equity securities | Recurring measurement [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 17 | 23
Diversified [Member] | Investment Segment [Member] | Equity securities | Recurring measurement [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 17 | 23
Diversified [Member] | Investment Segment [Member] | Equity securities | Recurring measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 0 | 0
Diversified [Member] | Investment Segment [Member] | Equity securities | Recurring measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 0 | 0
Energy sector [Member] | Investment Segment [Member] | Equity securities | Recurring measurement [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 1,461 | 1,895
Energy sector [Member] | Investment Segment [Member] | Equity securities | Recurring measurement [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 1,461 | 1,895
Energy sector [Member] | Investment Segment [Member] | Equity securities | Recurring measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 0 | 0
Energy sector [Member] | Investment Segment [Member] | Equity securities | Recurring measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 0 | 0
Energy sector [Member] | Investment Segment [Member] | Corporate Debt Securities [Member] | Recurring measurement [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 0 | 19
Energy sector [Member] | Investment Segment [Member] | Corporate Debt Securities [Member] | Recurring measurement [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 0 | 0
Energy sector [Member] | Investment Segment [Member] | Corporate Debt Securities [Member] | Recurring measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 0 | 19
Energy sector [Member] | Investment Segment [Member] | Corporate Debt Securities [Member] | Recurring measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 0 | 0
Financial [Member] | Investment Segment [Member] | Equity securities | Recurring measurement [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 2,094 | 417
Financial [Member] | Investment Segment [Member] | Equity securities | Recurring measurement [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 2,094 | 417
Financial [Member] | Investment Segment [Member] | Equity securities | Recurring measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 0 | 0
Financial [Member] | Investment Segment [Member] | Equity securities | Recurring measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 0 | 0
Financial [Member] | Investment Segment [Member] | Corporate Debt Securities [Member] | Recurring measurement [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 4 | 7
Financial [Member] | Investment Segment [Member] | Corporate Debt Securities [Member] | Recurring measurement [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 0 | 0
Financial [Member] | Investment Segment [Member] | Corporate Debt Securities [Member] | Recurring measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 4 | 7
Financial [Member] | Investment Segment [Member] | Corporate Debt Securities [Member] | Recurring measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 0 | 0
Financial [Member] | Investment Segment [Member] | Collateralized Mortgage Backed Securities [Member] | Recurring measurement [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 157 | 173
Financial [Member] | Investment Segment [Member] | Collateralized Mortgage Backed Securities [Member] | Recurring measurement [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 0 | 0
Financial [Member] | Investment Segment [Member] | Collateralized Mortgage Backed Securities [Member] | Recurring measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 157 | 173
Financial [Member] | Investment Segment [Member] | Collateralized Mortgage Backed Securities [Member] | Recurring measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 0 | 0
Sovereign Debt [Member] | Investment Segment [Member] | Corporate Debt Securities [Member] | Recurring measurement [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 13 | 0
Sovereign Debt [Member] | Investment Segment [Member] | Corporate Debt Securities [Member] | Recurring measurement [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 0 | 0
Sovereign Debt [Member] | Investment Segment [Member] | Corporate Debt Securities [Member] | Recurring measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 13 | 0
Sovereign Debt [Member] | Investment Segment [Member] | Corporate Debt Securities [Member] | Recurring measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 0 | 0
Funds [Member] | Investment Segment [Member] | Equity securities | Recurring measurement [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 0 | 0
Funds [Member] | Investment Segment [Member] | Equity securities | Recurring measurement [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 0 | 0
Funds [Member] | Investment Segment [Member] | Equity securities | Recurring measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 0 | 0
Funds [Member] | Investment Segment [Member] | Equity securities | Recurring measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 0 | 0
Industrial [Member] | Investment Segment [Member] | Equity securities | Recurring measurement [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 188 | 79
Industrial [Member] | Investment Segment [Member] | Equity securities | Recurring measurement [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 188 | 79
Industrial [Member] | Investment Segment [Member] | Equity securities | Recurring measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 0 | 0
Industrial [Member] | Investment Segment [Member] | Equity securities | Recurring measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 0 | 0
Technology [Member] | Investment Segment [Member] | Equity securities | Recurring measurement [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 5,795 | 5,635
Technology [Member] | Investment Segment [Member] | Equity securities | Recurring measurement [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 5,795 | 5,635
Technology [Member] | Investment Segment [Member] | Equity securities | Recurring measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 0 | 0
Technology [Member] | Investment Segment [Member] | Equity securities | Recurring measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 0 | 0
Utilities [Member] | Investment Segment [Member] | Corporate Debt Securities [Member] | Recurring measurement [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 0 | 28
Utilities [Member] | Investment Segment [Member] | Corporate Debt Securities [Member] | Recurring measurement [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 0 | 0
Utilities [Member] | Investment Segment [Member] | Corporate Debt Securities [Member] | Recurring measurement [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | 0 | 28
Utilities [Member] | Investment Segment [Member] | Corporate Debt Securities [Member] | Recurring measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Trading Securities |  | $ 0 | $ 0
[1] | Included in other assets in our consolidated balance sheets.
[2] | Included in accrued expenses and other liabilities in our consolidated balance sheets.

X
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13495-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 + Details
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