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Fair Value Measurements (Summary of Fair Value of Derivative Assets and Liabilities and Effect of Counterparty Netting) (Details) - USD ($) $ in Millions | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Net carrying value presented on balance sheet, floating-rate debt |  | $ 90 | $ 50
Difference In carrying value and fair value liability |  | (909) | 195
Net carrying value presented on balance sheet, fixed-rate debt, excluding capital leases | [1] | 8,584 | 8,629
Fixed Rate Debt Excluding Capital Leases [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Difference In carrying value and fair value liability | [1] | (909) | 195
Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Net carrying value presented on balance sheet, commodity derivative assets and investments |  | 156 | 194
Net carrying value presented on balance sheet, commodity derivative liabilities and debt |  | 8,706 | 8,708
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Rabbi Trust Assets [Member] | Investments And Long-term Receivables [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Rabbi trust assets |  | 94 | 83
Exchange-cleared Instruments [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash Collateral Received of Paid Not Offset on Balance Sheet |  | 0 |
Exchange-cleared Instruments [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Net carrying value presented on balance sheet, commodity derivative assets |  | 6 | 65
Net carrying value presented on balance sheet, commodity derivative liabilities |  |  | 2
OTC Instruments [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Net carrying value presented on balance sheet, commodity derivative assets |  | 5 | 1
Net carrying value presented on balance sheet, commodity derivative liabilities |  | 2 | 5
Physical Forward Contracts [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Net carrying value presented on balance sheet, commodity derivative assets | [2] | 51 | 45
Net carrying value presented on balance sheet, commodity derivative liabilities | [2] | 14 | 22
Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Effect of counterparty netting, commodity derivative assets |  | (570) | (2,401)
Effect of collateral netting, commodity derivative assets |  |  | (100)
Total assets, fair value disclosure gross |  | 726 | 2,695
Effect of counterparty netting, commodity derivative liabilities |  | (570) | (2,401)
Effect of collateral netting, commodity derivative liabilities |  | (68) |
Total liabilities, fair value disclosure gross |  | 10,253 | 10,914
Fair Value, Measurements, Recurring [Member] | Floating Rate Debt [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt, fair value gross |  | 90 | 50
Fair Value, Measurements, Recurring [Member] | Fixed Rate Debt Excluding Capital Leases [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt, fair value gross | [1] | 9,493 | 8,434
Fair Value, Measurements, Recurring [Member] | Rabbi Trust Assets [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Rabbi trust assets |  | 94 | 83
Fair Value, Measurements, Recurring [Member] | Exchange-cleared Instruments [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Commodity derivative assets, fair value gross |  | 574 | 2,554
Effect of counterparty netting, commodity derivative assets |  | (568) | (2,389)
Effect of collateral netting, commodity derivative assets |  |  | (100)
Commodity derivative liabilities, fair value gross |  | 636 | 2,391
Effect of counterparty netting, commodity derivative liabilities |  | (568) | (2,389)
Effect of collateral netting, commodity derivative liabilities |  | (68) |
Fair Value, Measurements, Recurring [Member] | OTC Instruments [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Commodity derivative assets, fair value gross |  | 7 | 13
Effect of counterparty netting, commodity derivative assets |  | (2) | (12)
Commodity derivative liabilities, fair value gross |  | 4 | 17
Effect of counterparty netting, commodity derivative liabilities |  | (2) | (12)
Fair Value, Measurements, Recurring [Member] | Physical Forward Contracts [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Commodity derivative assets, fair value gross | [2] | 51 | 45
Commodity derivative liabilities, fair value gross | [2] | 14 | 22
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets, fair value disclosure gross |  | 352 | 1,937
Total liabilities, fair value disclosure gross |  | 367 | 1,795
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Floating Rate Debt [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt, fair value gross |  | 90 | 50
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Rabbi Trust Assets [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Rabbi trust assets |  | 94 | 83
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Exchange-cleared Instruments [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Commodity derivative assets, fair value gross |  | 258 | 1,851
Commodity derivative liabilities, fair value gross |  | 277 | 1,745
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Physical Forward Contracts [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Commodity derivative assets, fair value gross | [2] |  | 3
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets, fair value disclosure gross |  | 373 | 756
Total liabilities, fair value disclosure gross |  | 9,885 | 9,119
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Fixed Rate Debt Excluding Capital Leases [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt, fair value gross | [1] | 9,493 | 8,434
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Exchange-cleared Instruments [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Commodity derivative assets, fair value gross |  | 316 | 703
Commodity derivative liabilities, fair value gross |  | 359 | 646
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | OTC Instruments [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Commodity derivative assets, fair value gross |  | 7 | 13
Commodity derivative liabilities, fair value gross |  | 4 | 17
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Physical Forward Contracts [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Commodity derivative assets, fair value gross | [2] | 50 | 40
Commodity derivative liabilities, fair value gross | [2] | 13 | 22
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total assets, fair value disclosure gross |  | 1 | 2
Total liabilities, fair value disclosure gross |  | 1 |
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Physical Forward Contracts [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Commodity derivative assets, fair value gross | [2] | 1 | $ 2
Commodity derivative liabilities, fair value gross | [2] | 1 |
Interest Rate Contract [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Net carrying value presented on balance sheet, commodity derivative liabilities |  | 16 |
Interest Rate Contract [Member] | Fair Value, Measurements, Recurring [Member] | Derivative Financial Instruments, Liabilities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Interest-rate derivatives |  | 16 |
Interest Rate Contract [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Derivative Financial Instruments, Liabilities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Interest-rate derivatives |  | $ 16 |
[1] | We carry fixed-rate debt on the balance sheet at amortized cost.
[2] | Physical forward contracts may have a larger value on the balance sheet than disclosed in the fair value hierarchy when the remaining contract term at the reporting date is greater than 12 months and the short-term portion is an asset while the long-term portion is a liability, or vice versa.

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