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Fair Value Measurements (Financial Instruments Measured At Fair Value On Recurring Basis) (Detail) - USD ($) $ in Millions | Sep. 30, 2017 | Jun. 30, 2017 | [1] | Dec. 31, 2016 | Sep. 30, 2016 | [3],[4] | Jun. 30, 2016 | [3] | Dec. 31, 2015 | [4]
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Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |  |  |  |  |
Available for sale, Fair Value | $ 83,686 |  |  | $ 80,115 |  |  |  |
Equity securities, at fair value | 910 |  |  | 814 |  |  |  |
Other Investments | 4,677 |  |  | 4,519 |  |  |  |
Securities lending collateral | 1,757 |  |  | 1,092 |  |  |  |
Investment Funds Limited Partnerships Partially Owned Investment Companies Fair Value [Member] |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |  |  |  |  |
Other Investments | 3,669 |  |  | 3,626 |  |  |  |
Other Investments [Member] |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |  |  |  |  |
Other Investments | 18 |  |  | 25 |  |  |  |
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |  |  |  |  |
Available for sale, Fair Value | 83,686 |  |  | 80,115 |  |  |  |
Equity securities, at fair value | 910 |  |  | 814 |  |  |  |
Short-term investments | 2,991 |  |  | 3,002 |  |  |  |
Other Investments | 990 |  |  | 868 |  |  |  |
Securities lending collateral | 1,757 |  |  | 1,092 |  |  |  |
Investment derivative instruments, assets | 15 |  |  | 31 |  |  |  |
Other Derivative Instruments Fair Value |  |  |  | 3 |  |  |  |
Separate Account Assets | 2,514 |  |  | 1,879 |  |  |  |
Total assets measured at fair value | 92,863 |  |  | 87,804 |  |  |  |
Investment derivative instruments, liabilities | 37 |  |  | 54 |  |  |  |
Other derivative instruments, liability | 27 |  |  | 13 |  |  |  |
Liabilities, Fair Value Disclosure, Recurring | 367 |  |  | 626 |  |  |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |  |  |  |  |
Available for sale, Fair Value | 2,941 |  |  | 2,175 |  |  |  |
Equity securities, at fair value | 858 |  |  | 773 |  |  |  |
Short-term investments | 1,804 |  |  | 1,757 |  |  |  |
Other Investments | 446 |  |  | 384 |  |  |  |
Investment derivative instruments, assets | 15 |  |  | 31 |  |  |  |
Other Derivative Instruments Fair Value |  |  |  | 3 |  |  |  |
Separate Account Assets | 2,414 |  |  | 1,784 |  |  |  |
Total assets measured at fair value | 8,478 |  |  | 6,907 |  |  |  |
Investment derivative instruments, liabilities | 37 |  |  | 54 |  |  |  |
Other derivative instruments, liability | 25 |  |  |  |  |  |  |
Liabilities, Fair Value Disclosure, Recurring | 62 |  |  | 54 |  |  |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |  |  |  |  |
Available for sale, Fair Value | 79,692 |  |  | 77,140 |  |  |  |
Short-term investments | 1,187 |  |  | 1,220 |  |  |  |
Other Investments | 292 |  |  | 259 |  |  |  |
Securities lending collateral | 1,757 |  |  | 1,092 |  |  |  |
Separate Account Assets | 100 |  |  | 95 |  |  |  |
Total assets measured at fair value | 83,028 |  |  | 79,806 |  |  |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |  |  |  |  |
Available for sale, Fair Value | 1,053 |  |  | 800 |  |  |  |
Equity securities, at fair value | 52 |  |  | 41 |  |  |  |
Short-term investments |  |  |  | 25 |  |  |  |
Other Investments | 252 |  |  | 225 |  |  |  |
Total assets measured at fair value | 1,357 |  |  | 1,091 |  |  |  |
Other derivative instruments, liability | 2 |  |  | 13 |  |  |  |
Liabilities, Fair Value Disclosure, Recurring | 305 |  |  | 572 |  |  |  |
Fair Value, Measurements, Recurring [Member] | U.S. Treasury And Agency [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |  |  |  |  |
Available for sale, Fair Value | 3,582 |  |  | 2,870 |  |  |  |
Fair Value, Measurements, Recurring [Member] | U.S. Treasury And Agency [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |  |  |  |  |
Available for sale, Fair Value | 2,941 |  |  | 2,175 |  |  |  |
Fair Value, Measurements, Recurring [Member] | U.S. Treasury And Agency [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |  |  |  |  |
Available for sale, Fair Value | 641 |  |  | 695 |  |  |  |
Fair Value, Measurements, Recurring [Member] | Foreign [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |  |  |  |  |
Available for sale, Fair Value | 23,099 |  |  | 21,440 |  |  |  |
Fair Value, Measurements, Recurring [Member] | Foreign [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |  |  |  |  |
Available for sale, Fair Value | 23,009 |  |  | 21,366 |  |  |  |
Fair Value, Measurements, Recurring [Member] | Foreign [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |  |  |  |  |
Available for sale, Fair Value | 90 |  |  | 74 |  |  |  |
Fair Value, Measurements, Recurring [Member] | Corporate [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |  |  |  |  |
Available for sale, Fair Value | 25,226 |  |  | 24,149 |  |  |  |
Fair Value, Measurements, Recurring [Member] | Corporate [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |  |  |  |  |
Available for sale, Fair Value | 24,307 |  |  | 23,468 |  |  |  |
Fair Value, Measurements, Recurring [Member] | Corporate [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |  |  |  |  |
Available for sale, Fair Value | 919 |  |  | 681 |  |  |  |
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Backed Securities [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |  |  |  |  |
Available for sale, Fair Value | 15,411 |  |  | 14,007 |  |  |  |
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |  |  |  |  |
Available for sale, Fair Value | 15,367 |  |  | 13,962 |  |  |  |
Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |  |  |  |  |
Available for sale, Fair Value | 44 |  |  | 45 |  |  |  |
Fair Value, Measurements, Recurring [Member] | States, Municipalities, And Political Subdivisions [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |  |  |  |  |
Available for sale, Fair Value | 16,368 |  |  | 17,649 |  |  |  |
Fair Value, Measurements, Recurring [Member] | States, Municipalities, And Political Subdivisions [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |  |  |  |  |
Available for sale, Fair Value | 16,368 |  |  | 17,649 |  |  |  |
Guaranteed Minimum Income Benefit [Member] |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | 303 | [1],[2] | $ 357 | 559 | [2] | $ 883 | $ 971 | $ 609
Guaranteed Minimum Income Benefit [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | 303 |  |  | 559 |  |  |  |
Guaranteed Minimum Income Benefit [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | $ 303 |  |  | 559 |  |  |  |
Guaranteed Minimum Income Benefit [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value |  |  |  | $ 559 |  |  |  |
[1] | Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the Consolidated balance sheets. The liability for GLB reinsurance was $635 million at September 30, 2017, and $684 million at June 30, 2017, which includes a fair value derivative adjustment of $303 million and $357 million, respectively.
[2] | Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the Consolidated balance sheets. The liability for GLB reinsurance was $635 million at September 30, 2017, and $853 million at December 31, 2016, which includes a fair value derivative adjustment of $303 million and $559 million, respectively
[3] | Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the Consolidated balance sheets. The liability for GLB reinsurance was $1.2 billion at September 30, 2016, and $1.3 billion at June 30, 2016, which includes a fair value derivative adjustment of $883 million and $971 million, respectively.
[4] | Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the Consolidated balance sheets. The liability for GLB reinsurance was $1.2 billion at September 30, 2016, and $888 million at December 31, 2015, which includes a fair value derivative adjustment of $883 million and $609 million, respectively.

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- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + 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 (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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