| Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] |
The following tables summarize information regarding marketable securities (dollars in millions): | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | March 31, 2012 | | | | Unrealized | | Fair | | Fair Value Measurements on a Recurring Basis | | Cost | | Gains | | Losses | | Value | | Level 1 | | Level 2 | | Level 3 | Cash and cash equivalents | | | | | | | | | | | | | | Available-for-sale securities | | | | | | | | | | | | | | U.S. government and agencies | $ | 5,001 |
| | $ | — |
| | $ | — |
| | $ | 5,001 |
| | $ | — |
| | $ | 5,001 |
| | $ | — |
| Sovereign debt | 380 |
| | — |
| | — |
| | 380 |
| | — |
| | 380 |
| | — |
| Certificates of deposit | 438 |
| | — |
| | — |
| | 438 |
| | — |
| | 438 |
| | — |
| Money market funds | 981 |
| | — |
| | — |
| | 981 |
| | 981 |
| | — |
| | — |
| Corporate debt | 5,180 |
| | — |
| | — |
| | 5,180 |
| | — |
| | 5,180 |
| | — |
| Total marketable securities classified as cash equivalents | $ | 11,980 |
| | $ | — |
| | $ | — |
| | 11,980 |
| | $ | 981 |
| | $ | 10,999 |
| | $ | — |
| Cash, time deposits, and other cash equivalents | | | | | | | 5,398 |
| | | | | | | Total cash and cash equivalents | | | | | | | $ | 17,378 |
| | | | | | | Marketable securities - current | | | | | | | | | | | | | | Available-for-sale securities | | | | | | | | | | | | | | U.S. government and agencies | $ | 3,622 |
| | $ | 1 |
| | $ | — |
| | $ | 3,623 |
| | $ | — |
| | $ | 3,623 |
| | $ | — |
| Sovereign debt | 77 |
| | 1 |
| | — |
| | 78 |
| | — |
| | 78 |
| | — |
| Certificates of deposit | 42 |
| | — |
| | — |
| | 42 |
| | — |
| | 42 |
| | — |
| Corporate debt | 4,260 |
| | 5 |
| | 3 |
| | 4,262 |
| | — |
| | 4,262 |
| | — |
| Total available-for-sale securities | $ | 8,001 |
| | $ | 7 |
| | $ | 3 |
| | 8,005 |
| | — |
| | 8,005 |
| | — |
| Trading securities | | | | | | | | | | | | | | Equity | | | $ | 5 |
| | $ | — |
| | 39 |
| | 39 |
| | — |
| | — |
| Sovereign debt(a) | | | 91 |
| | 8 |
| | 6,565 |
| | — |
| | 6,565 |
| | — |
| Other debt | | | 1 |
| | — |
| | 77 |
| | — |
| | 77 |
| | — |
| Total trading securities | | | $ | 97 |
| | $ | 8 |
| | 6,681 |
| | 39 |
| | 6,642 |
| | — |
| Total marketable securities - current | | | | | | | 14,686 |
| | 39 |
| | 14,647 |
| | — |
| Marketable securities - non-current | | | | | | | | | | | | | | Available-for-sale securities | | | | | | | | | | | | | | Equity(b) | $ | 404 |
| | $ | — |
| | $ | 5 |
| | 399 |
| | 399 |
| | — |
| | — |
| Total marketable securities - non-current | $ | 404 |
| | $ | — |
| | $ | 5 |
| | 399 |
| | 399 |
| | — |
| | — |
| Total marketable securities | | | | | | | $ | 15,085 |
| | $ | 438 |
| | $ | 14,647 |
| | $ | — |
| Restricted cash and marketable securities | | | | | | | | | | | | | Available-for-sale securities | | | | | | | | | | | | | | Money market funds | $ | 1,264 |
| | $ | — |
| | $ | — |
| | $ | 1,264 |
| | $ | 1,264 |
| | $ | — |
| | $ | — |
| Sovereign debt | 16 |
| | — |
| | — |
| | 16 |
| | — |
| | 16 |
| | — |
| Other | 163 |
| | — |
| | — |
| | 163 |
| | — |
| | 163 |
| | — |
| Total marketable securities classified as restricted cash and marketable securities | $ | 1,443 |
| | $ | — |
| | $ | — |
| | 1,443 |
| | $ | 1,264 |
| | $ | 179 |
| | $ | — |
| Restricted cash, time deposits, and other restricted cash equivalents | | | | | | | 632 |
| | | | | | | Total restricted cash and marketable securities | | | | | | | $ | 2,075 |
| | | | | | |
________ | | (a) | Unrealized gains/losses are primarily related to remeasurement of Canadian dollar (CAD) denominated securities. |
| | (b) | Represents our seven percent ownership in Peugeot S.A. (PSA) acquired in connection with our agreement with PSA to create a long-term and broad-scale global strategic alliance. The shares are subject to certain trading restrictions until May 29, 2012. The investment is recorded in Other assets and deferred income taxes. |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | December 31, 2011 | | | | Unrealized | | Fair | | Fair Value Measurements on a Recurring Basis | | Cost | | Gains | | Losses | | Value | | Level 1 | | Level 2 | | Level 3 | Cash and cash equivalents | | | | | | | | | | | | | | Available-for-sale securities | | | | | | | | | | | | | | U.S. government and agencies | $ | 239 |
| | $ | — |
| | $ | — |
| | $ | 239 |
| | $ | — |
| | $ | 239 |
| | $ | — |
| Sovereign debt | 490 |
| | — |
| | — |
| | 490 |
| | — |
| | 490 |
| | — |
| Certificates of deposit | 2,028 |
| | — |
| | — |
| | 2,028 |
| | — |
| | 2,028 |
| | — |
| Money market funds | 1,794 |
| | — |
| | — |
| | 1,794 |
| | 1,794 |
| | — |
| | — |
| Corporate debt | 5,112 |
| | — |
| | — |
| | 5,112 |
| | — |
| | 5,112 |
| | — |
| Total available-for-sale securities | $ | 9,663 |
| | $ | — |
| | $ | — |
| | 9,663 |
| | 1,794 |
| | 7,869 |
| | — |
| Trading securities | | | | | | | | | | | | | | Sovereign debt(a) | | | $ | 8 |
| | $ | — |
| | 497 |
| | — |
| | 497 |
| | — |
| Total trading securities | | | $ | 8 |
| | $ | — |
| | 497 |
| | — |
| | 497 |
| | — |
| Total marketable securities classified as cash equivalents | | | | | | | 10,160 |
| | $ | 1,794 |
| | $ | 8,366 |
| | $ | — |
| Cash, time deposits, and other cash equivalents | | | | | | | 5,911 |
| | | | | | | Total cash and cash equivalents | | | | | | | $ | 16,071 |
| | | | | | | Marketable securities - current | | | | | | | | | | | | | | Available-for-sale securities | | | | | | | | | | | | | | U.S. government and agencies | $ | 5,214 |
| | $ | 2 |
| | $ | — |
| | $ | 5,216 |
| | $ | — |
| | $ | 5,216 |
| | $ | — |
| Sovereign debt | 143 |
| | — |
| | — |
| | 143 |
| | — |
| | 143 |
| | — |
| Certificates of deposit | 178 |
| | — |
| | — |
| | 178 |
| | — |
| | 178 |
| | — |
| Corporate debt | 4,566 |
| | 3 |
| | 4 |
| | 4,565 |
| | — |
| | 4,565 |
| | — |
| Total available-for-sale securities | $ | 10,101 |
| | $ | 5 |
| | $ | 4 |
| | 10,102 |
| | — |
| | 10,102 |
| | — |
| Trading securities | | | | | | | | | | | | | | Equity | | | $ | — |
| | $ | 5 |
| | 34 |
| | 34 |
| | — |
| | — |
| Sovereign debt(a) | | | 18 |
| | 33 |
| | 5,936 |
| | — |
| | 5,936 |
| | — |
| Other debt | | | 1 |
| | 2 |
| | 76 |
| | — |
| | 76 |
| | — |
| Total trading securities | | | $ | 19 |
| | $ | 40 |
| | 6,046 |
| | 34 |
| | 6,012 |
| | — |
| Total marketable securities - current | | | | | | | $ | 16,148 |
| | $ | 34 |
| | $ | 16,114 |
| | $ | — |
| Restricted cash and marketable securities | | | | | | | | | | | | | Available-for-sale securities | | | | | | | | | | | | | | Money market funds | $ | 1,363 |
| | $ | — |
| | $ | — |
| | $ | 1,363 |
| | $ | 1,363 |
| | $ | — |
| | $ | — |
| Sovereign debt | 15 |
| | — |
| | — |
| | 15 |
| | — |
| | 15 |
| | — |
| Other | 161 |
| | 3 |
| | — |
| | 164 |
| | — |
| | 164 |
| | — |
| Total marketable securities classified as restricted cash and marketable securities | $ | 1,539 |
| | $ | 3 |
| | $ | — |
| | 1,542 |
| | $ | 1,363 |
| | $ | 179 |
| | $ | — |
| Restricted cash, time deposits, and other restricted cash equivalents
| | | | | | | 691 |
| | | | | | | Total restricted cash and marketable securities | | | | | | | $ | 2,233 |
| | | | | | |
________ | | (a) | Unrealized gains/losses are primarily related to remeasurement of CAD denominated securities |
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