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Fair Value (Tables)
9 Months Ended
Sep. 30, 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 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
September 30, 2023
Cash and cash equivalents$38,880 $35 $— $38,915 
Debt securities - available-for-sale:
U.S. government and agency obligations5,050 349 — 5,399 
State and municipal obligations— 7,053 — 7,053 
Corporate obligations15 21,462 182 21,659 
U.S. agency mortgage-backed securities— 7,474 — 7,474 
Non-U.S. agency mortgage-backed securities— 2,767 — 2,767 
Total debt securities - available-for-sale5,065 39,105 182 44,352 
Equity securities2,231 31 70 2,332 
Assets under management 1,420 2,094 102 3,616 
Total assets at fair value$47,596 $41,265 $354 $89,215 
Percentage of total assets at fair value53 %46 %%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 management 1,788 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 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
September 30, 2023
Debt securities - held-to-maturity$593 $74 $— $667 $682 
Long-term debt and other financing obligations$— $55,137 $— $55,137 $60,769 
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