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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Equity securities |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Balance- Beginning of year, assets | $ 69 | $ 57 | $ 44
Transfers into Level 3, assets | 0 | 0 | 0
Transfers out of Level 3, assets | (3) | 0 | 0
Change in Net Unrealized Gains (Losses) included in OCI, Assets | 0 | 1 | (2)
Net Realized Gains/Losses, Assets | 1 | (2) | 6
Purchased, assets | 23 | 34 | 37
Sales, assets | (17) | (21) | (28)
Settlements, assets | 0 | 0 | 0
Balance- End of year, assets | 73 | 69 | 57
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | 4 | (3) | (1)
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets | 0 | 0 |
Short-term investments |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Balance- Beginning of year, assets | 6 | 1 | 0
Transfers into Level 3, assets | 0 | 0 | 5
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 | 1 | 0 | 0
Purchased, assets | 14 | 6 | 9
Sales, assets | (2) | 0 | 0
Settlements, assets | (12) | (1) | (13)
Balance- End of year, assets | 5 | 6 | 1
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 | 0 |
Other investments |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Balance- Beginning of year, assets | 10 | 11 | 263
Transfers into Level 3, assets | 0 | 0 | 0
Transfers out of Level 3, assets | 0 | 0 | (252)
Change in Net Unrealized Gains (Losses) included in OCI, Assets | 0 | 0 | (2)
Net Realized Gains/Losses, Assets | 0 | 0 | 1
Purchased, assets | 0 | 0 | 50
Sales, assets | 0 | 0 | 0
Settlements, assets | 0 | (1) | (49)
Balance- End of year, assets | 10 | 10 | 11
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | 0 | 0 | 1
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets | 0 | 0 |
Available-for-sale Securities [Member] | Foreign |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Balance- Beginning of year, assets | 449 | 345 | 93
Transfers into Level 3, assets | 0 | 11 | 13
Transfers out of Level 3, assets | (16) | (24) | (2)
Change in Net Unrealized Gains (Losses) included in OCI, Assets | 19 | 13 | (12)
Net Realized Gains/Losses, Assets | (1) | (1) | (3)
Purchased, assets | 274 | 228 | 334
Sales, assets | (122) | (70) | (69)
Settlements, assets | (57) | (53) | (9)
Balance- End of year, assets | 546 | 449 | 345
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | 0 | 0 | (1)
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets | 16 | 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 | 1,451 | 1,299 | 1,037
Transfers into Level 3, assets | 134 | 23 | 24
Transfers out of Level 3, assets | (73) | (38) | (31)
Change in Net Unrealized Gains (Losses) included in OCI, Assets | (8) | (2) | (4)
Net Realized Gains/Losses, Assets | (30) | (4) | (5)
Purchased, assets | 708 | 577 | 672
Sales, assets | (186) | (125) | (164)
Settlements, assets | (423) | (279) | (230)
Balance- End of year, assets | 1,573 | 1,451 | 1,299
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | (5) | (2) | (7)
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets | (6) | (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 | 60 | 61 | 78
Transfers into Level 3, assets | 0 | 0 | 1
Transfers out of Level 3, assets | (1) | (16) | (3)
Change in Net Unrealized Gains (Losses) included in OCI, Assets | 0 | 0 | 0
Net Realized Gains/Losses, Assets | 0 | 0 | 0
Purchased, assets | 2 | 19 | 5
Sales, assets | 0 | (1) | 0
Settlements, assets | (1) | (3) | (20)
Balance- End of year, assets | 60 | 60 | 61
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 | $ 0 |

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- 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
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- 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
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- 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
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