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Fair Value Measurements (Financial Instruments Measured At Fair Value On Recurring Basis) (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value $ 78,470 $ 78,939
Equity Securities   937
Equity Securities, FV-NI 770  
Short-term investments 3,016 3,561
Other Investments 5,277 4,672
Securities lending collateral 1,926 1,737
US Treasury and Government [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 4,145 3,698
Foreign    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 21,416 21,030
Corporate securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 26,583 23,996
Mortgage-backed securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 15,540 15,290
States, municipalities, and political subdivisions    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 10,786 14,925
Estimate of Fair Value Measurement [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Other Investments 5,277 4,672
Investment Funds Limited Partnerships Partially Owned Investment Companies Fair Value [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Other Investments 4,244 3,623
Other Investments    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Other Investments 95 15
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 78,470 78,939
Equity Securities   937
Equity Securities, FV-NI 770  
Short-term investments 3,016 3,561
Other Investments 695 1,034
Securities lending collateral 1,926 1,737
Investment derivative instruments, assets 28 18
Other derivative instruments, assets 25 1
Separate Account Assets 2,823 2,734
Total assets measured at fair value 87,753 [1] 88,961 [2]
Investment derivative instruments, liability 153 30
Liabilities Related to Investment Contracts, Fair Value Disclosure 605 257
Other derivative instruments, liability   23
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] | US Treasury and Government [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 4,145 3,698
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Foreign    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 21,416 21,030
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Corporate securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 26,583 23,996
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Mortgage-backed securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 15,540 15,290
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] | States, municipalities, and political subdivisions    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 10,786 14,925
Fair Value, Measurements, Recurring [Member] | Level 1    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 3,400 3,129
Equity Securities   893
Equity Securities, FV-NI 713  
Short-term investments 1,575 2,309
Other Investments 381 466
Investment derivative instruments, assets 28 18
Other derivative instruments, assets 25 1
Separate Account Assets 2,686 2,635
Total assets measured at fair value 8,808 [1] 9,451 [2]
Investment derivative instruments, liability 38 30
Liabilities Related to Investment Contracts, Fair Value Disclosure 38 51
Other derivative instruments, liability   21
Fair Value, Measurements, Recurring [Member] | Level 1 | US Treasury and Government [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 3,400 3,129
Fair Value, Measurements, Recurring [Member] | Level 2    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 73,365 74,602
Short-term investments 1,440 1,252
Other Investments 303 305
Securities lending collateral 1,926 1,737
Separate Account Assets 137 99
Total assets measured at fair value 77,171 [1] 77,995 [2]
Investment derivative instruments, liability 115  
Liabilities Related to Investment Contracts, Fair Value Disclosure 115  
Fair Value, Measurements, Recurring [Member] | Level 2 | US Treasury and Government [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 745 569
Fair Value, Measurements, Recurring [Member] | Level 2 | Foreign    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 21,071 20,937
Fair Value, Measurements, Recurring [Member] | Level 2 | Corporate securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 25,284 22,959
Fair Value, Measurements, Recurring [Member] | Level 2 | Mortgage-backed securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 15,479 15,212
Fair Value, Measurements, Recurring [Member] | Level 2 | States, municipalities, and political subdivisions    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 10,786 14,925
Fair Value, Measurements, Recurring [Member] | Level 3    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 1,705 1,208
Equity Securities   44
Equity Securities, FV-NI 57  
Short-term investments 1  
Other Investments 11 263
Total assets measured at fair value 1,774 [1] 1,515 [2]
Liabilities Related to Investment Contracts, Fair Value Disclosure 452 206
Other derivative instruments, liability   2
Fair Value, Measurements, Recurring [Member] | Level 3 | Foreign    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 345 93
Fair Value, Measurements, Recurring [Member] | Level 3 | Corporate securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 1,299 1,037
Fair Value, Measurements, Recurring [Member] | Level 3 | Mortgage-backed securities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available for sale, Fair Value 61 78
Guaranteed Minimum Income Benefit | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member]    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross 452 [3] 204 [4]
Guaranteed Minimum Income Benefit | Fair Value, Measurements, Recurring [Member] | Level 3    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross $ 452 [3] $ 204 [4]
[1] Excluded from the table above are partially-owned investments, investment funds, and limited partnerships of $4,244 million and other investments of $95 million at December 31, 2018 measured using NAV as a practical expedient
[2] Excluded from the table above are partially-owned investments, investment funds, and limited partnerships of $3,623 million and other investments of $15 million at December 31, 2017 measured using NAV as a practical expedient.
[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. Refer to Note 4 c) for additional information.
[4] (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. Refer to Note 4 c) for additional information.