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Fair Value Measurement (Unaudited) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Derivatives:    
Derivative assets $ 62 $ 59
Derivatives:    
Derivative liabilities 317 320
Escrow Deposit Disbursements Related to Property Acquisition 414  
Fair Value, Measurements, Recurring [Member] | Carrying Amount, Fair Value Disclosure [Member]
    
Investment securities (current and long-term):    
Investment securities 460 [1],[2] 44 [1],[2]
Legally restricted funds (long-term):    
Legally restricted funds 168 [1],[2],[3] 182 [1],[2],[3]
Derivatives:    
Derivative assets 63 [2],[4] 69 [2],[4]
Derivatives:    
Derivative liabilities 318 [2],[4] 332 [2]
Long-term debt, including current portion 20,296 [5] 20,706 [5]
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member]
    
Investment securities (current and long-term):    
Investment securities 460 [1],[2] 44 [1],[2]
Legally restricted funds (long-term):    
Legally restricted funds 168 [1],[2],[3] 182 [1],[2],[3]
Derivatives:    
Derivative assets 63 [2],[4] 69 [2],[4]
Total assets 691 295
Derivatives:    
Derivative liabilities 318 [2],[4] 332 [2]
Long-term debt, including current portion 20,607 [5] 20,487 [5]
Total liabilities 20,925 20,819
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
    
Investment securities (current and long-term):    
Investment securities 438 [1],[2] 23 [1],[2]
Legally restricted funds (long-term):    
Legally restricted funds 6 [1],[2],[3] 28 [1],[2],[3]
Derivatives:    
Derivative assets 8 [2],[4] 5 [2],[4]
Total assets 452 56
Derivatives:    
Derivative liabilities 1 [2],[4] 1 [2]
Long-term debt, including current portion 0 [5] 0 [5]
Total liabilities 1 1
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
    
Investment securities (current and long-term):    
Investment securities 22 [1],[2] 21 [1],[2]
Legally restricted funds (long-term):    
Legally restricted funds 162 [1],[2],[3] 154 [1],[2],[3]
Derivatives:    
Derivative assets 55 [2],[4] 64 [2],[4]
Total assets 239 239
Derivatives:    
Derivative liabilities 19 [2],[4] 20 [2]
Long-term debt, including current portion 20,607 [5] 20,487 [5]
Total liabilities 20,626 20,507
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
    
Investment securities (current and long-term):    
Investment securities 0 [1],[2] 0 [1],[2]
Legally restricted funds (long-term):    
Legally restricted funds 0 [1],[2],[3] 0 [1],[2],[3]
Derivatives:    
Derivative assets 0 [2],[4] 0 [2],[4]
Total assets 0 0
Derivatives:    
Derivative liabilities 298 [2],[4] 311 [2]
Long-term debt, including current portion 0 [5] 0 [5]
Total liabilities 298 311
Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] | Carrying Amount, Fair Value Disclosure [Member]
    
Derivatives:    
Derivative liabilities 12 [2],[4] 16 [2],[4]
Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] | Estimate of Fair Value Measurement [Member]
    
Derivatives:    
Derivative liabilities 12 [2],[4] 16 [2],[4]
Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] | Fair Value, Inputs, Level 1 [Member]
    
Derivatives:    
Derivative liabilities 0 [2],[4] 0 [2],[4]
Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] | Fair Value, Inputs, Level 2 [Member]
    
Derivatives:    
Derivative liabilities 12 [2],[4] 16 [2],[4]
Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] | Fair Value, Inputs, Level 3 [Member]
    
Derivatives:    
Derivative liabilities 0 [2],[4] 0 [2],[4]
Fair Value, Measurements, Recurring [Member] | Crude Oil Options [Member] | Carrying Amount, Fair Value Disclosure [Member]
    
Derivatives:    
Derivative liabilities 298 [2],[4] 309 [2],[4]
Fair Value, Measurements, Recurring [Member] | Crude Oil Options [Member] | Estimate of Fair Value Measurement [Member]
    
Derivatives:    
Derivative liabilities 298 [2],[4] 309 [2],[4]
Fair Value, Measurements, Recurring [Member] | Crude Oil Options [Member] | Fair Value, Inputs, Level 1 [Member]
    
Derivatives:    
Derivative liabilities 0 [2],[4] 0 [2],[4]
Fair Value, Measurements, Recurring [Member] | Crude Oil Options [Member] | Fair Value, Inputs, Level 2 [Member]
    
Derivatives:    
Derivative liabilities 0 [2],[4] 0 [2],[4]
Fair Value, Measurements, Recurring [Member] | Crude Oil Options [Member] | Fair Value, Inputs, Level 3 [Member]
    
Derivatives:    
Derivative liabilities 298 [2],[4] 309 [2],[4]
Fair Value, Measurements, Recurring [Member] | Natural gas swaps [Member] | Carrying Amount, Fair Value Disclosure [Member]
    
Derivatives:    
Derivative liabilities 7 [2],[4] 4 [2],[4]
Fair Value, Measurements, Recurring [Member] | Natural gas swaps [Member] | Estimate of Fair Value Measurement [Member]
    
Derivatives:    
Derivative liabilities 7 [2],[4] 4 [2],[4]
Fair Value, Measurements, Recurring [Member] | Natural gas swaps [Member] | Fair Value, Inputs, Level 1 [Member]
    
Derivatives:    
Derivative liabilities 0 [2],[4] 0 [2],[4]
Fair Value, Measurements, Recurring [Member] | Natural gas swaps [Member] | Fair Value, Inputs, Level 2 [Member]
    
Derivatives:    
Derivative liabilities 7 [2],[4] 4 [2],[4]
Fair Value, Measurements, Recurring [Member] | Natural gas swaps [Member] | Fair Value, Inputs, Level 3 [Member]
    
Derivatives:    
Derivative liabilities 0 [2],[4] 0 [2],[4]
Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] | Carrying Amount, Fair Value Disclosure [Member]
    
Derivatives:    
Derivative liabilities 1 [2],[4]  
Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] | Estimate of Fair Value Measurement [Member]
    
Derivatives:    
Derivative liabilities 1 [2],[4]  
Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] | Fair Value, Inputs, Level 1 [Member]
    
Derivatives:    
Derivative liabilities 1 [2],[4]  
Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] | Fair Value, Inputs, Level 2 [Member]
    
Derivatives:    
Derivative liabilities 0 [2],[4]  
Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] | Fair Value, Inputs, Level 3 [Member]
    
Derivatives:    
Derivative liabilities 0 [2],[4]  
Fair Value, Measurements, Recurring [Member] | Copper forward contracts [Member] | Carrying Amount, Fair Value Disclosure [Member]
    
Derivatives:    
Derivative liabilities   1 [2],[4]
Fair Value, Measurements, Recurring [Member] | Copper forward contracts [Member] | Estimate of Fair Value Measurement [Member]
    
Derivatives:    
Derivative liabilities   1 [2],[4]
Fair Value, Measurements, Recurring [Member] | Copper forward contracts [Member] | Fair Value, Inputs, Level 1 [Member]
    
Derivatives:    
Derivative liabilities   1 [2],[4]
Fair Value, Measurements, Recurring [Member] | Copper forward contracts [Member] | Fair Value, Inputs, Level 2 [Member]
    
Derivatives:    
Derivative liabilities   0 [2],[4]
Fair Value, Measurements, Recurring [Member] | Copper forward contracts [Member] | Fair Value, Inputs, Level 3 [Member]
    
Derivatives:    
Derivative liabilities   0 [2],[4]
Fair Value, Measurements, Recurring [Member] | Plains Offshore Warrants [Member] | Carrying Amount, Fair Value Disclosure [Member]
    
Derivatives:    
Derivative liabilities   2 [2],[6]
Fair Value, Measurements, Recurring [Member] | Plains Offshore Warrants [Member] | Estimate of Fair Value Measurement [Member]
    
Derivatives:    
Derivative liabilities   2 [2],[6]
Fair Value, Measurements, Recurring [Member] | Plains Offshore Warrants [Member] | Fair Value, Inputs, Level 1 [Member]
    
Derivatives:    
Derivative liabilities   0 [2],[6]
Fair Value, Measurements, Recurring [Member] | Plains Offshore Warrants [Member] | Fair Value, Inputs, Level 2 [Member]
    
Derivatives:    
Derivative liabilities   0 [2],[6]
Fair Value, Measurements, Recurring [Member] | Plains Offshore Warrants [Member] | Fair Value, Inputs, Level 3 [Member]
    
Derivatives:    
Derivative liabilities   2 [2],[6]
Fair Value, Measurements, Recurring [Member] | Money market funds [Member] | Carrying Amount, Fair Value Disclosure [Member]
    
Investment securities (current and long-term):    
Investment securities 434 [1],[2],[7] 18 [1],[2]
Legally restricted funds (long-term):    
Legally restricted funds 6 [1],[2],[3] 28 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Money market funds [Member] | Estimate of Fair Value Measurement [Member]
    
Investment securities (current and long-term):    
Investment securities 434 [1],[2],[7] 18 [1],[2]
Legally restricted funds (long-term):    
Legally restricted funds 6 [1],[2],[3] 28 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Money market funds [Member] | Fair Value, Inputs, Level 1 [Member]
    
Investment securities (current and long-term):    
Investment securities 434 [1],[2],[7] 18 [1],[2]
Legally restricted funds (long-term):    
Legally restricted funds 6 [1],[2],[3] 28 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Money market funds [Member] | Fair Value, Inputs, Level 2 [Member]
    
Investment securities (current and long-term):    
Investment securities 0 [1],[2],[7] 0 [1],[2]
Legally restricted funds (long-term):    
Legally restricted funds 0 [1],[2],[3] 0 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Money market funds [Member] | Fair Value, Inputs, Level 3 [Member]
    
Investment securities (current and long-term):    
Investment securities 0 [1],[2],[7] 0 [1],[2]
Legally restricted funds (long-term):    
Legally restricted funds 0 [1],[2],[3] 0 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | U.S. core fixed income fund [Member] | Carrying Amount, Fair Value Disclosure [Member]
    
Investment securities (current and long-term):    
Investment securities 22 [1],[2] 21 [1],[2]
Legally restricted funds (long-term):    
Legally restricted funds 50 [1],[2],[3] 48 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | U.S. core fixed income fund [Member] | Estimate of Fair Value Measurement [Member]
    
Investment securities (current and long-term):    
Investment securities 22 [1],[2] 21 [1],[2]
Legally restricted funds (long-term):    
Legally restricted funds 50 [1],[2],[3] 48 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | U.S. core fixed income fund [Member] | Fair Value, Inputs, Level 1 [Member]
    
Investment securities (current and long-term):    
Investment securities 0 [1],[2] 0 [1],[2]
Legally restricted funds (long-term):    
Legally restricted funds 0 [1],[2],[3] 0 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | U.S. core fixed income fund [Member] | Fair Value, Inputs, Level 2 [Member]
    
Investment securities (current and long-term):    
Investment securities 22 [1],[2] 21 [1],[2]
Legally restricted funds (long-term):    
Legally restricted funds 50 [1],[2],[3] 48 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | U.S. core fixed income fund [Member] | Fair Value, Inputs, Level 3 [Member]
    
Investment securities (current and long-term):    
Investment securities 0 [1],[2] 0 [1],[2]
Legally restricted funds (long-term):    
Legally restricted funds 0 [1],[2],[3] 0 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Carrying Amount, Fair Value Disclosure [Member]
    
Investment securities (current and long-term):    
Investment securities 4 [1],[2] 5 [1],[2]
Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Estimate of Fair Value Measurement [Member]
    
Investment securities (current and long-term):    
Investment securities 4 [1],[2] 5 [1],[2]
Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Fair Value, Inputs, Level 1 [Member]
    
Investment securities (current and long-term):    
Investment securities 4 [1],[2] 5 [1],[2]
Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Fair Value, Inputs, Level 2 [Member]
    
Investment securities (current and long-term):    
Investment securities 0 [1],[2] 0 [1],[2]
Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Fair Value, Inputs, Level 3 [Member]
    
Investment securities (current and long-term):    
Investment securities 0 [1],[2] 0 [1],[2]
Fair Value, Measurements, Recurring [Member] | Government bonds and notes [Member] | Carrying Amount, Fair Value Disclosure [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 35 [1],[2],[3] 28 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Government bonds and notes [Member] | Estimate of Fair Value Measurement [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 35 [1],[2],[3] 28 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Government bonds and notes [Member] | Fair Value, Inputs, Level 1 [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 0 [1],[2],[3] 0 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Government bonds and notes [Member] | Fair Value, Inputs, Level 2 [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 35 [1],[2],[3] 28 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Government bonds and notes [Member] | Fair Value, Inputs, Level 3 [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 0 [1],[2],[3] 0 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Government mortgage-backed securities [Member] | Carrying Amount, Fair Value Disclosure [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 31 [1],[2],[3] 34 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Government mortgage-backed securities [Member] | Estimate of Fair Value Measurement [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 31 [1],[2],[3] 34 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Government mortgage-backed securities [Member] | Fair Value, Inputs, Level 1 [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 0 [1],[2],[3] 0 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Government mortgage-backed securities [Member] | Fair Value, Inputs, Level 2 [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 31 [1],[2],[3] 34 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Government mortgage-backed securities [Member] | Fair Value, Inputs, Level 3 [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 0 [1],[2],[3] 0 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Corporate bonds [Member] | Carrying Amount, Fair Value Disclosure [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 29 [1],[2],[3] 28 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Corporate bonds [Member] | Estimate of Fair Value Measurement [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 29 [1],[2],[3] 28 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Corporate bonds [Member] | Fair Value, Inputs, Level 1 [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 0 [1],[2],[3] 0 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Corporate bonds [Member] | Fair Value, Inputs, Level 2 [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 29 [1],[2],[3] 28 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Corporate bonds [Member] | Fair Value, Inputs, Level 3 [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 0 [1],[2],[3] 0 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Asset-backed securities [Member] | Carrying Amount, Fair Value Disclosure [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 16 [1],[2],[3] 15 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Asset-backed securities [Member] | Estimate of Fair Value Measurement [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 16 [1],[2],[3] 15 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Asset-backed securities [Member] | Fair Value, Inputs, Level 1 [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 0 [1],[2],[3] 0 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Asset-backed securities [Member] | Fair Value, Inputs, Level 2 [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 16 [1],[2],[3] 15 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Asset-backed securities [Member] | Fair Value, Inputs, Level 3 [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 0 [1],[2],[3] 0 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Municipal bonds [Member] | Carrying Amount, Fair Value Disclosure [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 1 [1],[2],[3] 1 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Municipal bonds [Member] | Estimate of Fair Value Measurement [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 1 [1],[2],[3] 1 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Municipal bonds [Member] | Fair Value, Inputs, Level 1 [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 0 [1],[2],[3] 0 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Municipal bonds [Member] | Fair Value, Inputs, Level 2 [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 1 [1],[2],[3] 1 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Municipal bonds [Member] | Fair Value, Inputs, Level 3 [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 0 [1],[2],[3] 0 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] | Carrying Amount, Fair Value Disclosure [Member]
    
Derivatives:    
Derivative assets 55 [2],[4] 63 [2],[4]
Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] | Estimate of Fair Value Measurement [Member]
    
Derivatives:    
Derivative assets 55 [2],[4] 63 [2],[4]
Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] | Fair Value, Inputs, Level 1 [Member]
    
Derivatives:    
Derivative assets 0 [2],[4] 0 [2],[4]
Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] | Fair Value, Inputs, Level 2 [Member]
    
Derivatives:    
Derivative assets 55 [2],[4] 63 [2],[4]
Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] | Fair Value, Inputs, Level 3 [Member]
    
Derivatives:    
Derivative assets 0 [2],[4] 0 [2],[4]
Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] | Carrying Amount, Fair Value Disclosure [Member]
    
Derivatives:    
Derivative assets 6 [2],[4] 6 [2],[4]
Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] | Estimate of Fair Value Measurement [Member]
    
Derivatives:    
Derivative assets 6 [2],[4] 6 [2],[4]
Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] | Fair Value, Inputs, Level 1 [Member]
    
Derivatives:    
Derivative assets 6 [2],[4] 5 [2],[4]
Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] | Fair Value, Inputs, Level 2 [Member]
    
Derivatives:    
Derivative assets 0 [2],[4] 1 [2],[4]
Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] | Fair Value, Inputs, Level 3 [Member]
    
Derivatives:    
Derivative assets 0 [2],[4] 0 [2],[4]
Fair Value, Measurements, Recurring [Member] | Copper forward contracts [Member] | Carrying Amount, Fair Value Disclosure [Member]
    
Derivatives:    
Derivative assets 2 [2],[4]  
Fair Value, Measurements, Recurring [Member] | Copper forward contracts [Member] | Estimate of Fair Value Measurement [Member]
    
Derivatives:    
Derivative assets 2 [2],[4]  
Fair Value, Measurements, Recurring [Member] | Copper forward contracts [Member] | Fair Value, Inputs, Level 1 [Member]
    
Derivatives:    
Derivative assets 2 [2],[4]  
Fair Value, Measurements, Recurring [Member] | Copper forward contracts [Member] | Fair Value, Inputs, Level 2 [Member]
    
Derivatives:    
Derivative assets 0 [2],[4]  
Fair Value, Measurements, Recurring [Member] | Copper forward contracts [Member] | Fair Value, Inputs, Level 3 [Member]
    
Derivatives:    
Derivative assets 0 [2],[4]  
Deferred Option Premiums and Accrued Interest [Member]
    
Derivatives:    
Derivative liabilities 329 444
Other Current Assets [Member]
    
Derivatives:    
Derivative assets 7 6
Derivatives:    
Derivative liabilities 0 0
Other Current Assets [Member] | Fair Value, Measurements, Recurring [Member] | Time Deposits [Member] | Carrying Amount, Fair Value Disclosure [Member]
    
Investment securities (current and long-term):    
Investment securities 225 15
Other Assets [Member] | Fair Value, Measurements, Recurring [Member] | Time Deposits [Member] | Carrying Amount, Fair Value Disclosure [Member]
    
Investment securities (current and long-term):    
Investment securities   $ 210
[1] Current portion included in other current assets and long-term portion included in other assets.
[2] Recorded at fair value.
[3] Excluded $225 million of time deposits (which approximated fair value) at June 30, 2014 (included in other current assets), and at December 31, 2013 ($15 million included in other current assets and $210 million in other assets), associated with the Cerro Verde royalty dispute.
[4] Refer to Note 7 for further discussion and balance sheet classifications. Crude oil options are net of $329 million at June 30, 2014, and $444 million at December 31, 2013, for deferred premiums and accrued interest.
[5] Recorded at cost except for debt assumed in acquisitions, which were recorded at fair value at the respective acquisition dates.
[6] Included in other liabilities.
[7] ncluded $414 million held in an escrow account for future oil and gas property acquisitions (refer to Note 2 for further discussion).