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Fair Value (Tables)
12 Months Ended
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Financial Assets and Liabilities, Measured at Fair Value Recurring Basis [Table Text Block]
The following table presents a summary of fair value measurements by level and carrying values for items measured at fair value on a recurring basis in the Consolidated Balance Sheets:
(in millions)Quoted Prices
in Active
Markets
(Level 1)
Other
Observable
Inputs
(Level 2)
Unobservable
Inputs
(Level 3)
Total
Fair and Carrying
Value
December 31, 2023
Cash and cash equivalents$25,345 $82 $— $25,427 
Debt securities - available-for-sale:
U.S. government and agency obligations4,167 276 — 4,443 
State and municipal obligations— 7,353 — 7,353 
Corporate obligations15 21,800 202 22,017 
U.S. agency mortgage-backed securities— 8,296 — 8,296 
Non-U.S. agency mortgage-backed securities— 2,786 — 2,786 
Total debt securities - available-for-sale4,182 40,511 202 44,895 
Equity securities2,468 16 69 2,553 
Assets under management1,505 2,140 110 3,755 
Total assets at fair value$33,500 $42,749 $381 $76,630 
Percentage of total assets at fair value44 %55 %%100 %
December 31, 2022
Cash and cash equivalents$23,202 $163 $— $23,365 
Debt securities - available-for-sale:
U.S. government and agency obligations3,505 304 — 3,809 
State and municipal obligations— 7,248 — 7,248 
Corporate obligations21,695 192 21,894 
U.S. agency mortgage-backed securities— 6,586 — 6,586 
Non-U.S. agency mortgage-backed securities— 2,784 — 2,784 
Total debt securities - available-for-sale3,512 38,617 192 42,321 
Equity securities2,043 35 70 2,148 
Assets under management1,788 2,203 96 4,087 
Total assets at fair value$30,545 $41,018 $358 $71,921 
Percentage of total assets at fair value42 %57 %%100 %
Fair Value Measurements, Nonrecurring [Table Text Block]
The following table presents a summary of fair value measurements by level and carrying values for certain financial instruments not measured at fair value on a recurring basis in the Consolidated Balance Sheets:
(in millions)Quoted Prices
in Active
Markets
(Level 1)
Other
Observable
Inputs
(Level 2)
Unobservable
Inputs
(Level 3)
Total
Fair
Value
Total Carrying Value
December 31, 2023
Debt securities - held-to-maturity$524 $72 $— $596 $603 
Long-term debt and other financing obligations$— $59,851 $— $59,851 $61,449 
December 31, 2022
Debt securities - held-to-maturity$577 $102 $— $679 $696 
Long-term debt and other financing obligations$— $53,626 $— $53,626 $56,823