XML 77 R74.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Fair value measurements Fair Value Measurements (Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation) (Details) - Level 3 - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Equity securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance- Beginning of year, assets | $ 57 | $ 44 | $ 41 |
Transfers into Level 3, assets | 0 | 0 | 0 |
Transfers out of Level 3, assets | 0 | 0 | 0 |
Change in Net Unrealized Gains (Losses) included in OCI, Assets | 1 | (2) | (1) |
Net Realized Gains/Losses, Assets | (2) | 6 | 2 |
Purchased, assets | 34 | 37 | 24 |
Sales, assets | (21) | (28) | (22) |
Settlements, assets | 0 | 0 | 0 |
Balance- End of year, assets | 69 | 57 | 44 |
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | (3) | (1) | (1) |
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets | 0 |  |  |
Short-term investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance- Beginning of year, assets | 1 | 0 | 25 |
Transfers into Level 3, assets | 0 | 5 | 0 |
Transfers out of Level 3, assets | 0 | 0 | 0 |
Change in Net Unrealized Gains (Losses) included in OCI, Assets | 0 | 0 | 0 |
Net Realized Gains/Losses, Assets | 0 | 0 | 0 |
Purchased, assets | 6 | 9 | 16 |
Sales, assets | 0 | 0 | 0 |
Settlements, assets | (1) | (13) | (41) |
Balance- End of year, assets | 6 | 1 | 0 |
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | 0 | 0 | 0 |
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets | 0 |  |  |
Other investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance- Beginning of year, assets | 11 | 263 | 225 |
Transfers into Level 3, assets | 0 | 0 | 0 |
Transfers out of Level 3, assets | 0 | (252) | 0 |
Change in Net Unrealized Gains (Losses) included in OCI, Assets | 0 | (2) | 6 |
Net Realized Gains/Losses, Assets | 0 | 1 | 0 |
Purchased, assets | 0 | 50 | 56 |
Sales, assets | 0 | 0 | 0 |
Settlements, assets | (1) | (49) | (24) |
Balance- End of year, assets | 10 | 11 | 263 |
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | 0 | 1 | 0 |
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets | 0 |  |  |
Available-for-sale Securities [Member] | Foreign |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance- Beginning of year, assets | 345 | 93 | 74 |
Transfers into Level 3, assets | 11 | 13 | 0 |
Transfers out of Level 3, assets | (24) | (2) | (3) |
Change in Net Unrealized Gains (Losses) included in OCI, Assets | 13 | (12) | 3 |
Net Realized Gains/Losses, Assets | (1) | (3) | 0 |
Purchased, assets | 228 | 334 | 84 |
Sales, assets | (70) | (69) | (59) |
Settlements, assets | (53) | (9) | (6) |
Balance- End of year, assets | 449 | 345 | 93 |
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | 0 | (1) | (1) |
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets | 7 |  |  |
Available-for-sale Securities [Member] | Corporate securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance- Beginning of year, assets | 1,299 | 1,037 | 681 |
Transfers into Level 3, assets | 23 | 24 | 231 | [1]
Transfers out of Level 3, assets | (38) | (31) | (93) |
Change in Net Unrealized Gains (Losses) included in OCI, Assets | (2) | (4) | (12) |
Net Realized Gains/Losses, Assets | (4) | (5) | 0 |
Purchased, assets | 577 | 672 | 521 | [1]
Sales, assets | (125) | (164) | (111) |
Settlements, assets | (279) | (230) | (180) |
Balance- End of year, assets | 1,451 | 1,299 | 1,037 |
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | (2) | (7) | (2) |
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets | (8) |  |  |
Available-for-sale Securities [Member] | Mortgage-backed securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance- Beginning of year, assets | 61 | 78 | 45 |
Transfers into Level 3, assets | 0 | 1 | 50 |
Transfers out of Level 3, assets | (16) | (3) | 0 |
Change in Net Unrealized Gains (Losses) included in OCI, Assets | 0 | 0 | 0 |
Net Realized Gains/Losses, Assets | 0 | 0 | 0 |
Purchased, assets | 19 | 5 | 8 |
Sales, assets | (1) | 0 | (1) |
Settlements, assets | (3) | (20) | (24) |
Balance- End of year, assets | 60 | 61 | 78 |
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | 0 | $ 0 | $ 0 |
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets | $ 0 |  |  |
[1] | Transfers into and Purchases in Level 3 primarily consist of privately-placed fixed income securities.

X
- Definition Amount of unrealized gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_ShortTermInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_OtherLongTermInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=us-gaap_AvailableforsaleSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_ForeignGovernmentDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_MortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |