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Fair Value (Recurring Measurements) (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Debt securities: |  |  |  |
Unsecured debentures | $ 427 | [1] | $ 435 | [1]
Certificates of deposit | 109 | [1] | 151 | [1]
Government debt securities | 26 | [1] | 25 | [1]
Subtotal | 562 | [1] | 611 | [1]
Equity securities: |  |  |  |
Mutual funds | 45 | [1] | 44 | [1]
Subtotal | 45 | [1] | 44 | [1]
Total available-for-sale | 607 | [1] | 655 | [1]
Equity securities: |  |  |  |
Mutual funds | 13 |  | 13 |
Total trading | 13 |  | 13 |
DERIVATIVES: |  |  |  |
Total derivatives | 222 |  | 240 |
TOTAL ASSETS | 842 |  | 908 |
DERIVATIVES: |  |  |  |
Total derivatives | 475 |  | 371 |
TOTAL LIABILITIES | 475 |  | 371 |
Interest rate derivatives [Member] |  |  |  |
DERIVATIVES: |  |  |  |
Total derivatives | 46 |  | 98 |
DERIVATIVES: |  |  |  |
Total derivatives | 376 |  | 322 |
Cross currency derivatives [Member] |  |  |  |
DERIVATIVES: |  |  |  |
Total derivatives | 4 |  | 5 |
DERIVATIVES: |  |  |  |
Total derivatives | 11 |  | 11 |
Foreign currency derivatives [Member] |  |  |  |
DERIVATIVES: |  |  |  |
Total derivatives | 123 |  | 113 |
DERIVATIVES: |  |  |  |
Total derivatives | 44 |  | 21 |
Commodity derivatives [Member] |  |  |  |
DERIVATIVES: |  |  |  |
Total derivatives | 49 |  | 24 |
DERIVATIVES: |  |  |  |
Total derivatives | 44 |  | 17 |
Level 1 [Member] |  |  |  |
Debt securities: |  |  |  |
Unsecured debentures | 0 | [1] | 0 | [1]
Certificates of deposit | 0 | [1] | 0 | [1]
Government debt securities | 0 | [1] | 0 | [1]
Subtotal | 0 | [1] | 0 | [1]
Equity securities: |  |  |  |
Mutual funds | 0 | [1] | 0 | [1]
Subtotal | 0 | [1] | 0 | [1]
Total available-for-sale | 0 | [1] | 0 | [1]
Equity securities: |  |  |  |
Mutual funds | 13 |  | 13 |
Total trading | 13 |  | 13 |
DERIVATIVES: |  |  |  |
Total derivatives | 0 |  | 0 |
TOTAL ASSETS | 13 |  | 13 |
DERIVATIVES: |  |  |  |
Total derivatives | 0 |  | 0 |
TOTAL LIABILITIES | 0 |  | 0 |
Level 1 [Member] | Interest rate derivatives [Member] |  |  |  |
DERIVATIVES: |  |  |  |
Total derivatives | 0 |  | 0 |
DERIVATIVES: |  |  |  |
Total derivatives | 0 |  | 0 |
Level 1 [Member] | Cross currency derivatives [Member] |  |  |  |
DERIVATIVES: |  |  |  |
Total derivatives | 0 |  | 0 |
DERIVATIVES: |  |  |  |
Total derivatives | 0 |  | 0 |
Level 1 [Member] | Foreign currency derivatives [Member] |  |  |  |
DERIVATIVES: |  |  |  |
Total derivatives | 0 |  | 0 |
DERIVATIVES: |  |  |  |
Total derivatives | 0 |  | 0 |
Level 1 [Member] | Commodity derivatives [Member] |  |  |  |
DERIVATIVES: |  |  |  |
Total derivatives | 0 |  | 0 |
DERIVATIVES: |  |  |  |
Total derivatives | 0 |  | 0 |
Level 2 [Member] |  |  |  |
Debt securities: |  |  |  |
Unsecured debentures | 427 | [1] | 435 | [1]
Certificates of deposit | 109 | [1] | 151 | [1]
Government debt securities | 26 | [1] | 25 | [1]
Subtotal | 562 | [1] | 611 | [1]
Equity securities: |  |  |  |
Mutual funds | 45 | [1] | 44 | [1]
Subtotal | 45 | [1] | 44 | [1]
Total available-for-sale | 607 | [1] | 655 | [1]
Equity securities: |  |  |  |
Mutual funds | 0 |  | 0 |
Total trading | 0 |  | 0 |
DERIVATIVES: |  |  |  |
Total derivatives | 114 |  | 136 |
TOTAL ASSETS | 721 |  | 791 |
DERIVATIVES: |  |  |  |
Total derivatives | 381 |  | 263 |
TOTAL LIABILITIES | 381 |  | 263 |
Level 2 [Member] | Interest rate derivatives [Member] |  |  |  |
DERIVATIVES: |  |  |  |
Total derivatives | 46 |  | 98 |
DERIVATIVES: |  |  |  |
Total derivatives | 289 |  | 221 |
Level 2 [Member] | Cross currency derivatives [Member] |  |  |  |
DERIVATIVES: |  |  |  |
Total derivatives | 4 |  | 5 |
DERIVATIVES: |  |  |  |
Total derivatives | 11 |  | 11 |
Level 2 [Member] | Foreign currency derivatives [Member] |  |  |  |
DERIVATIVES: |  |  |  |
Total derivatives | 18 |  | 15 |
DERIVATIVES: |  |  |  |
Total derivatives | 40 |  | 16 |
Level 2 [Member] | Commodity derivatives [Member] |  |  |  |
DERIVATIVES: |  |  |  |
Total derivatives | 46 |  | 18 |
DERIVATIVES: |  |  |  |
Total derivatives | 41 |  | 15 |
Level 3 [Member] |  |  |  |
Debt securities: |  |  |  |
Unsecured debentures | 0 | [1] | 0 | [1]
Certificates of deposit | 0 | [1] | 0 | [1]
Government debt securities | 0 | [1] | 0 | [1]
Subtotal | 0 | [1] | 0 | [1]
Equity securities: |  |  |  |
Mutual funds | 0 | [1] | 0 | [1]
Subtotal | 0 | [1] | 0 | [1]
Total available-for-sale | 0 | [1] | 0 | [1]
Equity securities: |  |  |  |
Mutual funds | 0 |  | 0 |
Total trading | 0 |  | 0 |
DERIVATIVES: |  |  |  |
Total derivatives | 108 |  | 104 |
TOTAL ASSETS | 108 |  | 104 |
DERIVATIVES: |  |  |  |
Total derivatives | 94 |  | 108 |
TOTAL LIABILITIES | 94 |  | 108 |
Level 3 [Member] | Interest rate derivatives [Member] |  |  |  |
DERIVATIVES: |  |  |  |
Total derivatives | 0 |  | 0 |
DERIVATIVES: |  |  |  |
Total derivatives | 87 |  | 101 |
Level 3 [Member] | Cross currency derivatives [Member] |  |  |  |
DERIVATIVES: |  |  |  |
Total derivatives | 0 |  | 0 |
DERIVATIVES: |  |  |  |
Total derivatives | 0 |  | 0 |
Level 3 [Member] | Foreign currency derivatives [Member] |  |  |  |
DERIVATIVES: |  |  |  |
Total derivatives | 105 |  | 98 |
DERIVATIVES: |  |  |  |
Total derivatives | 4 |  | 5 |
Level 3 [Member] | Commodity derivatives [Member] |  |  |  |
DERIVATIVES: |  |  |  |
Total derivatives | 3 |  | 6 |
DERIVATIVES: |  |  |  |
Total derivatives | $ 3 |  | $ 2 |
[1] | Amortized cost approximated fair value at March 31, 2014 and December 31, 2013.

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