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Fair Value of Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2023
Fair Value Disclosures [Abstract]  
Fair Value of Financial Instruments [Table Text Block]
Following is a summary of fair value measurements for investments as of September 30, 2023 and December 31, 2022:
Fair ValueLevel 1Level 2Level 3
(Amounts are in millions)
September 30, 2023$13,230 2,483 10,747 — 
December 31, 202211,558 2,137 9,421 —