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Cash, Cash Equivalents and Current Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2017
Cash and Cash Equivalents [Abstract] |
Cash and Cash Equivalent Composition | At the end of 2017 and 2016, cash, cash equivalents and current marketable securities were comprised of:
(Dollars in Millions) |  | 2017
|  | Carrying Amount |  |  | Estimated Fair Value |  | Cash & Cash Equivalents |  | Current Marketable Securities
Cash |  | $ | 2,929 |  |  |  | 2,929 |  |  | $ | 2,929 |  |  | — |
U.S. Gov't Securities(1) |  | — |  |  |  | — |  |  | — |  |  | — |
Other Sovereign Securities(1) |  | 279 |  |  |  | 279 |  |  | 219 |  |  | 60 |
U.S. Reverse repurchase agreements |  | 4,025 |  |  |  | 4,025 |  |  | 4,025 |  |  | — |
Other Reverse repurchase agreements |  | — |  |  |  | — |  |  | — |  |  | — |
Corporate debt securities(1) |  | 289 |  |  |  | 289 |  |  | 244 |  |  | 45 |
Money market funds |  | 4,288 |  |  |  | 4,288 |  |  | 4,288 |  |  | — |
Time deposits(1) |  | 1,176 |  |  |  | 1,176 |  |  | 1,175 |  |  | 1 |
Subtotal |  | $ | 12,986 |  |  |  | 12,986 |  |  | 12,880 |  |  | 106 |
Gov't Securities |  | $ | 4,864 |  |  |  | 4,864 |  |  | 4,833 |  |  | 31 |
Other Sovereign Securities |  | 186 |  |  |  | 186 |  |  | 80 |  |  | 106 |
Corporate debt securities |  | 260 |  |  |  | 260 |  |  | 31 |  |  | 229 |
Subtotal available for sale(2) |  | $ | 5,310 |  |  |  | 5,310 |  |  | 4,944 |  |  | 366 |
Total cash, cash equivalents and current marketable securities |  |  |  |  |  |  |  | $ | 17,824 |  |  | 472 |
In 2017, the carrying amount was the same as the estimated fair value.
(Dollars in Millions) |  | 2016
|  | Carrying Amount |  | Unrecognized Gain |  | Unrecognized Loss |  | Estimated Fair Value |  | Cash Equivalents |  | Current Marketable Securities
Cash |  | $ | 1,979 |  |  | — |  |  | — |  |  | 1,979 |  |  | 1,979 |  |  | — |
U.S. Gov't Securities(1) |  | 10,832 |  |  | — |  |  | (1 | ) |  | 10,831 |  |  | 2,249 |  |  | 8,583 |
Other Sovereign Securities(1) |  | 1,299 |  |  | — |  |  | — |  |  | 1,299 |  |  | 120 |  |  | 1,179 |
U.S. Reverse repurchase agreements |  | 6,103 |  |  | — |  |  | — |  |  | 6,103 |  |  | 6,103 |  |  | — |
Other Reverse repurchase agreements |  | 240 |  |  | — |  |  | — |  |  | 240 |  |  | 240 |  |  | — |
Corporate debt securities(1) |  | 754 |  |  | — |  |  | — |  |  | 754 |  |  | — |  |  | 754 |
Money market funds |  | 7,187 |  |  | — |  |  | — |  |  | 7,187 |  |  | 7,187 |  |  | — |
Time deposits(1) |  | 1,094 |  |  | — |  |  | — |  |  | 1,094 |  |  | 1,094 |  |  | — |
Subtotal |  | $ | 29,488 |  |  | — |  |  | (1 | ) |  | 29,487 |  |  | 18,972 |  |  | 10,516 |
|  |  |  | Unrealized Gain |  | Unrealized Loss |  |  |  |  |  |
Gov't Securities |  | $ | 10,277 |  |  | 5 |  |  | (51 | ) |  | 10,231 |  |  | — |  |  | 10,231 |
Other Sovereign Securities |  | 90 |  |  | — |  |  | — |  |  | 90 |  |  |  |  | 90 |
Corporate debt securities |  | 1,777 |  |  | 1 |  |  | (12 | ) |  | 1,766 |  |  | — |  |  | 1,766 |
Equity investments |  | 34 |  |  | 298 |  |  | — |  |  | 332 |  |  |  |  | 332 |
Subtotal available for sale(2) |  | $ | 12,178 |  |  | 304 |  |  | (63 | ) |  | 12,419 |  |  | — |  |  | 12,419 |
Total cash, cash equivalents and current marketable securities |  |  |  |  |  |  |  |  |  | $ | 18,972 |  |  | 22,935 |
(1) Held to maturity investments are reported at amortized cost and realized gains or losses are reported in earnings. (2) Available for sale 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, 2017 are as follows:
(Dollars in Millions) |  | Cost Basis |  | Fair Value
Due within one year |  | $ | 5,214 |  |  | 5,214 |
Due after one year through five years |  | 96 |  |  | 96 |
Due after five years through ten years |  | — |  |  | — |
Total debt securities |  | $ | 5,310 |  |  | 5,310 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62557-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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