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Derivative Instruments and Hedging Activities - Part 2 (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Assets |  |
Derivative Assets, Gross | $ 222 | $ 240
Liabilities |  |
Derivative Liabilities, Gross | 475 | 371
Subject to netting arrangement [Member] |  |
Assets |  |
Derivative Assets, Gross | 92 | 91
Derivative Assets Not Offset Under Netting Arrangements | (18) | (9)
Derivative Assets Not Offset By Collateral | 0 | (3)
Derivative Assets, Net | 74 | 79
Liabilities |  |
Derivative Liabilities, Gross | 438 | 314
Derivative Liabilities Not Offset Under Netting Arrangements | (18) | (9)
Derivative Liabilities Not Offset By Collateral | (16) | (6)
Derivative Liabilities, Net | 404 | 299
Current [Member] |  |
Assets |  |
Derivative Assets, Gross | 55 | 32
Liabilities |  |
Derivative Liabilities, Gross | 177 | 157
Noncurrent [Member] |  |
Assets |  |
Derivative Assets, Gross | 167 | 208
Liabilities |  |
Derivative Liabilities, Gross | 298 | 214
Designated as Hedging Instruments [Member] |  |
Assets |  |
Derivative Assets, Gross | 85 | 113
Liabilities |  |
Derivative Liabilities, Gross | 440 | 351
Not Designated as Hedging Instruments [Member] |  |
Assets |  |
Derivative Assets, Gross | 137 | 127
Liabilities |  |
Derivative Liabilities, Gross | 35 | 20
No longer carried at fair value [Member] |  |
Assets |  |
Derivative Assets, Gross | 165 | 169
Liabilities |  |
Derivative Liabilities, Gross | 187 | 190
Interest rate derivatives [Member] |  |
Assets |  |
Derivative Assets, Gross | 46 | 98
Liabilities |  |
Derivative Liabilities, Gross | 376 | 322
Interest rate derivatives [Member] | Designated as Hedging Instruments [Member] |  |
Assets |  |
Derivative Assets, Gross | 44 | 96
Liabilities |  |
Derivative Liabilities, Gross | 373 | 318
Interest rate derivatives [Member] | Not Designated as Hedging Instruments [Member] |  |
Assets |  |
Derivative Assets, Gross | 2 | 2
Liabilities |  |
Derivative Liabilities, Gross | 3 | 4
Cross currency derivatives [Member] |  |
Assets |  |
Derivative Assets, Gross | 4 | 5
Liabilities |  |
Derivative Liabilities, Gross | 11 | 11
Cross currency derivatives [Member] | Designated as Hedging Instruments [Member] |  |
Assets |  |
Derivative Assets, Gross | 4 | 5
Liabilities |  |
Derivative Liabilities, Gross | 11 | 11
Cross currency derivatives [Member] | Not Designated as Hedging Instruments [Member] |  |
Assets |  |
Derivative Assets, Gross | 0 | 0
Liabilities |  |
Derivative Liabilities, Gross | 0 | 0
Foreign currency derivatives [Member] |  |
Assets |  |
Derivative Assets, Gross | 123 | 113
Liabilities |  |
Derivative Liabilities, Gross | 44 | 21
Foreign currency derivatives [Member] | Designated as Hedging Instruments [Member] |  |
Assets |  |
Derivative Assets, Gross | 7 | 4
Liabilities |  |
Derivative Liabilities, Gross | 34 | 15
Foreign currency derivatives [Member] | Not Designated as Hedging Instruments [Member] |  |
Assets |  |
Derivative Assets, Gross | 116 | 109
Liabilities |  |
Derivative Liabilities, Gross | 10 | 6
Commodity derivatives [Member] |  |
Assets |  |
Derivative Assets, Gross | 49 | 24
Liabilities |  |
Derivative Liabilities, Gross | 44 | 17
Commodity derivatives [Member] | Designated as Hedging Instruments [Member] |  |
Assets |  |
Derivative Assets, Gross | 30 | 8
Liabilities |  |
Derivative Liabilities, Gross | 22 | 7
Commodity derivatives [Member] | Not Designated as Hedging Instruments [Member] |  |
Assets |  |
Derivative Assets, Gross | 19 | 16
Liabilities |  |
Derivative Liabilities, Gross | $ 22 | $ 10

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