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Investments - Equity Investments (Details) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2024 | Jun. 30, 2023
Increase (Decrease) In Equity Investments [Roll Forward] |  |
Marketable securities, beginning balance | $ 506 |
Marketable securities, Purchases | 0 |
Marketable securities, Sales | (23) |
Marketable securities, Changes in Fair Value | (9) |
Marketable Securities, Other | 24 |
Marketable securities, ending balance | 498 |
Nonmarketable securities, beginning balance | 1,223 |
Nonmarketable Securities, Purchases | 18 |
Nonmarketable Securities, Sales | 0 |
Nonmarketable Securities, Changes in Fair Value | 2 |
Nonmarketable Securities, Other | (32) |
Nonmarketable securities, ending balance | 1,211 |
Total equity investments, beginning balance | 1,729 |
Total equity investments, Purchases | 18 |
Total equity investments, Sales | (23) | $ (44)
Total equity investments, Changes in Fair Value | (7) |
Total equity investments, Other | (8) |
Total equity investments, ending balance | $ 1,709 |

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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481664/323-10-45-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481687/323-10-50-3 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(10)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 25 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-25 + Details
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- Definition The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-13 + Details
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