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Investments Investments (Limited Partnership Investments) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2020 | Jul. 15, 2020 | Jan. 02, 2020 | Dec. 31, 2019
Limited Partnership [Member] | Fair Value Measured at Net Asset Value Per Share [Member] |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Investments | $ 311 | $ 311 |  |  | $ 320
BeiGene [Member] |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Carrying value of equity method investment | $ 2,500 | $ 2,500 |  |  |
Equity Method Investment, Aggregate Cost |  |  |  | $ 2,800 |
Ownership percentage | 20.40% | 20.40% |  | 20.50% |
Equity Method Investments,Quoted Market Price | $ 3,000 | $ 3,000 |  | $ 2,600 |
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity |  |  |  | $ 2,400 |
Equity method investment, change in carrying value | 111 | 111 |  |  |
Income (Loss) from Equity Method Investments | 75 | 75 |  |  |
Equity Method Investment, Amortization of Difference Between Carrying Amount and Underlying Equity | $ 36 | $ 36 |  |  |
BeiGene [Member] | Subsequent Event [Member] |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Equity Method Investment, Aggregate Cost |  |  | $ 421 |  |
Minimum [Member] | BeiGene [Member] |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  | 8 years |  |  |
Maximum [Member] | BeiGene [Member] |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  | 15 years |  |  |

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- Definition Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=SL6742756-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 35 -Paragraph 54B -URI http://asc.fasb.org/extlink&oid=117332851&loc=SL7495116-110257 + Details
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