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Fair Value Fair Value of Derivative Contracts (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Cross-currency swap agreements |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Net amount | $ 0 |  | $ 0 |  | $ 0
Net amount | (21) |  | (21) |  | (52)
Energy commodity derivative contracts(a) |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Net amount | 291 |  | 291 |  | 590
Net amount | (16) |  | (16) |  | (19)
Interest rate swap agreements |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Net amount | 836 |  | 836 |  | 377
Net amount | 0 |  | 0 |  | (17)
Cross-currency swap agreements |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Balance sheet asset fair value measurements by level | 13 |  | 13 |  | 0
Contracts available for netting | 13 |  | 13 |  | 0
Balance sheet liability fair value measurements by level | (34) |  | (34) |  | (52)
Contracts available for netting | 13 |  | 13 |  | 0
Cross-currency swap agreements | Level 1 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Balance sheet asset fair value measurements by level | 0 |  | 0 |  | 0
Balance sheet liability fair value measurements by level | 0 |  | 0 |  | 0
Cross-currency swap agreements | Level 2 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Balance sheet asset fair value measurements by level | 13 |  | 13 |  | 0
Balance sheet liability fair value measurements by level | (34) |  | (34) |  | (52)
Cross-currency swap agreements | Level 3 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Balance sheet asset fair value measurements by level | 0 |  | 0 |  | 0
Balance sheet liability fair value measurements by level | 0 |  | 0 |  | 0
Cross-currency swap agreements | Cash collateral held(b) |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash collateral held(b) | 0 |  | 0 |  | 0
Collateral posted(c) | 0 |  | 0 |  | 0
Interest rate swap agreements |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Balance sheet asset fair value measurements by level | 836 |  | 836 |  | 385
Contracts available for netting | 0 |  | 0 |  | 8
Balance sheet liability fair value measurements by level | 0 |  | 0 |  | (25)
Contracts available for netting | 0 |  | 0 |  | 8
Interest rate swap agreements | Level 1 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Balance sheet asset fair value measurements by level | 0 |  | 0 |  | 0
Balance sheet liability fair value measurements by level | 0 |  | 0 |  | 0
Interest rate swap agreements | Level 2 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Balance sheet asset fair value measurements by level | 836 |  | 836 |  | 385
Balance sheet liability fair value measurements by level | 0 |  | 0 |  | (25)
Interest rate swap agreements | Level 3 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Balance sheet asset fair value measurements by level | 0 |  | 0 |  | 0
Balance sheet liability fair value measurements by level | 0 |  | 0 |  | 0
Interest rate swap agreements | Cash collateral held(b) |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash collateral held(b) | 0 |  | 0 |  | 0
Collateral posted(c) | 0 |  | 0 |  | 0
Energy commodity derivative contracts(a) |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Balance sheet asset fair value measurements by level | 323 |  | 323 |  | 639
Contracts available for netting | 32 |  | 32 |  | 12
Balance sheet liability fair value measurements by level | (66) |  | (66) |  | (31)
Contracts available for netting | 32 |  | 32 |  | 12
Fair Value, Assets Liabilites Net, Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Derivatives-net asset (liability) | (2) | $ (49) | (15) | $ (61) |
Total gains or (losses) included in earnings | (3) | 0 | (9) | 0 |
Settlements | 5 | 12 | 24 | 24 |
Derivatives-net asset (liability) | 0 | (37) | 0 | (37) |
The amount of total gains or (losses) for the period included in earnings attributable to the change in unrealized gains or (losses) relating to assets held at the reporting date | 0 | $ 1 | 0 | $ 3 |
Energy commodity derivative contracts(a) | Level 1 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Balance sheet asset fair value measurements by level | 6 |  | 6 |  | 48
Balance sheet liability fair value measurements by level | (19) |  | (19) |  | (4)
Energy commodity derivative contracts(a) | Level 2 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Balance sheet asset fair value measurements by level | 317 |  | 317 |  | 589
Balance sheet liability fair value measurements by level | (47) |  | (47) |  | (10)
Energy commodity derivative contracts(a) | Level 3 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Balance sheet asset fair value measurements by level | 0 |  | 0 |  | 2
Balance sheet liability fair value measurements by level | 0 |  | 0 |  | (17)
Energy commodity derivative contracts(a) | Cash collateral held(b) |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash collateral held(b) | 0 |  | 0 |  | 37
Collateral posted(c) | $ 18 |  | $ 18 |  | $ 0

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