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Fair Value (Tables)
3 Months Ended
Mar. 31, 2024
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 Condensed 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
March 31, 2024
Cash and cash equivalents$28,367 $47 $— $28,414 
Debt securities - available-for-sale:
U.S. government and agency obligations4,275 194 — 4,469 
State and municipal obligations— 6,878 — 6,878 
Corporate obligations28 21,324 199 21,551 
U.S. agency mortgage-backed securities— 8,552 — 8,552 
Non-U.S. agency mortgage-backed securities— 2,682 — 2,682 
Total debt securities - available-for-sale4,303 39,630 199 44,132 
Equity securities1,640 16 69 1,725 
Assets under management 1,636 1,876 107 3,619 
Total assets at fair value$35,946 $41,569 $375 $77,890 
Percentage of total assets at fair value46 %53 %%100 %
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 management 1,505 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 %
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 Condensed 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
March 31, 2024
Debt securities - held-to-maturity$522 $67 $— $589 $597 
Long-term debt and other financing obligations$— $63,489 $— $63,489 $66,299 
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