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Fair Value (Tables)
12 Months Ended
Dec. 31, 2021
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, 2021
Cash and cash equivalents$21,359 $16 $— $21,375 
Debt securities - available-for-sale:
U.S. government and agency obligations3,017 181 — 3,198 
State and municipal obligations— 7,106 — 7,106 
Corporate obligations40 20,916 218 21,174 
U.S. agency mortgage-backed securities— 5,901 — 5,901 
Non-U.S. agency mortgage-backed securities— 2,838 — 2,838 
Total debt securities - available-for-sale3,057 36,942 218 40,217 
Equity securities2,090 23 64 2,177 
Assets under management1,972 2,376 101 4,449 
Total assets at fair value$28,478 $39,357 $383 $68,218 
Percentage of total assets at fair value42 %57 %%100 %
December 31, 2020
Cash and cash equivalents$16,841 $80 $— $16,921 
Debt securities - available-for-sale:
U.S. government and agency obligations3,241 224 — 3,465 
State and municipal obligations— 7,328 — 7,328 
Corporate obligations25 19,424 288 19,737 
U.S. agency mortgage-backed securities— 7,091 — 7,091 
Non-U.S. agency mortgage-backed securities— 2,207 — 2,207 
Total debt securities - available-for-sale3,266 36,274 288 39,828 
Equity securities1,795 33 — 1,828 
Assets under management1,774 2,250 52 4,076 
Total assets at fair value$23,676 $38,637 $340 $62,653 
Percentage of total assets at fair value38 %61 %%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, 2021
Debt securities - held-to-maturity$534 $102 $$643 $641 
Long-term debt and other financing obligations$— $52,583 $— $52,583 $46,003 
December 31, 2020
Debt securities - held-to-maturity$466 $108 $73 $647 $638 
Long-term debt and other financing obligations$— $51,254 $— $51,254 $42,171