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Cash, cash equivalents and current marketable securities (Tables) | 12 Months Ended
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Dec. 31, 2023
Cash and Cash Equivalents [Abstract] |
Cash and Cash Equivalent Composition | At the end of the fiscal year 2023 and 2022, cash, cash equivalents and current marketable securities comprised:
(Dollars in Millions) |  | 2023
| Carrying Amount |  |  |  | Unrecognized Loss |  | Estimated Fair Value | Cash & Cash Equivalents |  | Current Marketable Securities
Cash |  | $3,340 |  |  |  | — |  | 3,340 |  | 3,340 |  | —
Non-U.S. Sovereign Securities(1) |  | 522 |  |  |  | — |  | 522 |  | 174 |  | 348
U.S. Reverse repurchase agreements |  | 4,377 |  |  |  | — |  | 4,377 |  | 4,377 |  | —
Corporate debt securities(1) |  | 338 |  |  |  | — |  | 338 |  | 189 |  | 149
Money market funds |  | 4,814 |  |  |  | — |  | 4,814 |  | 4,814 |  | —
Time deposits(1) |  | 662 |  |  |  | — |  | 662 |  | 662 |  | —
Subtotal |  | $14,053 |  |  |  | — |  | 14,053 |  | 13,556 |  | 497
U.S. Gov't Securities |  | $8,562 |  |  |  | — |  | 8,562 |  | 8,259 |  | 303
U.S. Gov't Agencies |  | 71 |  |  |  | (1) |  | 70 |  | — |  | 70
Other Sovereign Securities |  | 5 |  |  |  | — |  | 5 |  | 1 |  | 4
Corporate and other debt securities |  | 237 |  |  |  | — |  | 237 |  | 43 |  | 194
Subtotal available for sale(2) |  | $8,875 |  |  |  | (1) |  | 8,874 |  | 8,303 |  | 571
Total cash, cash equivalents and current marketable securities |  |  |  |  |  |  |  |  |  | $21,859 |  | 1,068
(Dollars in Millions) |  | 2022
| Carrying Amount |  |  |  | Unrecognized Loss |  | Estimated Fair Value | Cash & Cash Equivalents |  | Current Marketable Securities
Cash |  | $3,691 |  |  |  | — |  | 3,691 |  | 3,691 |  | —
U.S. Reverse repurchase agreements |  | 1,419 |  |  |  | — |  | 1,419 |  | 1,419 |  | —
Corporate debt securities(1) |  | 873 |  |  |  | (1) |  | 872 |  | — |  | 873
Money market funds |  | 5,368 |  |  |  | — |  | 5,368 |  | 5,368 |  | —
Time deposits(1) |  | 443 |  |  |  | — |  | 443 |  | 443 |  | —
Subtotal |  | 11,794 |  |  |  | (1) |  | 11,793 |  | 10,921 |  | 873
U.S. Gov't Securities |  | $9,959 |  |  |  | (28) |  | 9,931 |  | 1,922 |  | 8,009
U.S. Gov't Agencies |  | 210 |  |  |  | (5) |  | 205 |  | — |  | 205
Corporate and other debt securities |  | 352 |  |  |  | (1) |  | 351 |  | 46 |  | 305
Subtotal available for sale(2) |  | $10,521 |  |  |  | (34) |  | 10,487 |  | 1,968 |  | 8,519
Total cash, cash equivalents and current marketable securities |  |  |  |  |  |  |  |  |  | $12,889 |  | 9,392
(1)Held to maturity investments are reported at amortized cost and realized gains or losses are reported in earnings. (2)Available for sale debt securities are reported at fair value with unrealized gains and losses reported net of taxes in other comprehensive income.
Contractual Maturities of Available for Sale Securities | The contractual maturities of the available for sale debt securities at December 31, 2023 are as follows:
(Dollars in Millions) | Cost Basis |  | Fair Value
Due within one year |  | $8,865 |  | 8,864
Due after one year through five years |  | 10 |  | 10
Due after five years through ten years |  | — |  | —
Total debt securities |  | $8,875 |  | 8,874

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