Fair Value Measurement (Details) (Recurring [Member], USD $) | 3 Months Ended | 12 Months Ended |
In Millions, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013 |
Fair value transfers [Abstract] | ' | ' |
Amount of transfers between Level 1 and Level 2 of the fair value hierarchy | $0 | $0 |
Fair Value [Member] | ' | ' |
Fair value assets and liabilities measured on a recurring basis [Line Items] | ' | ' |
Assets at fair value | 1,404 | 4 |
Liabilities at fair value | 23 | 18 |
Level 1 [Member] | ' | ' |
Fair value assets and liabilities measured on a recurring basis [Line Items] | ' | ' |
Assets at fair value | 0 | 0 |
Liabilities at fair value | 21 | 18 |
Level 2 [Member] | ' | ' |
Fair value assets and liabilities measured on a recurring basis [Line Items] | ' | ' |
Assets at fair value | 1,404 | 4 |
Liabilities at fair value | 2 | 0 |
Level 3 [Member] | ' | ' |
Fair value assets and liabilities measured on a recurring basis [Line Items] | ' | ' |
Assets at fair value | 0 | 0 |
Liabilities at fair value | 0 | 0 |
Derivatives: [Member] | Commodities [Member] | Fair Value [Member] | ' | ' |
Fair value assets and liabilities measured on a recurring basis [Line Items] | ' | ' |
Liabilities at fair value | 1 | 4 |
Derivatives: [Member] | Commodities [Member] | Level 1 [Member] | ' | ' |
Fair value assets and liabilities measured on a recurring basis [Line Items] | ' | ' |
Liabilities at fair value | 1 | 4 |
Derivatives: [Member] | Commodities [Member] | Level 2 [Member] | ' | ' |
Fair value assets and liabilities measured on a recurring basis [Line Items] | ' | ' |
Liabilities at fair value | 0 | 0 |
Derivatives: [Member] | Commodities [Member] | Level 3 [Member] | ' | ' |
Fair value assets and liabilities measured on a recurring basis [Line Items] | ' | ' |
Liabilities at fair value | 0 | 0 |
Derivatives: [Member] | Embedded derivatives [Member] | Fair Value [Member] | ' | ' |
Fair value assets and liabilities measured on a recurring basis [Line Items] | ' | ' |
Assets at fair value | 2 | 3 |
Liabilities at fair value | 1 | ' |
Derivatives: [Member] | Embedded derivatives [Member] | Level 1 [Member] | ' | ' |
Fair value assets and liabilities measured on a recurring basis [Line Items] | ' | ' |
Assets at fair value | 0 | 0 |
Liabilities at fair value | 0 | ' |
Derivatives: [Member] | Embedded derivatives [Member] | Level 2 [Member] | ' | ' |
Fair value assets and liabilities measured on a recurring basis [Line Items] | ' | ' |
Assets at fair value | 2 | 3 |
Liabilities at fair value | 1 | ' |
Derivatives: [Member] | Embedded derivatives [Member] | Level 3 [Member] | ' | ' |
Fair value assets and liabilities measured on a recurring basis [Line Items] | ' | ' |
Assets at fair value | 0 | 0 |
Liabilities at fair value | 0 | ' |
Derivatives: [Member] | Foreign currency [Member] | Fair Value [Member] | ' | ' |
Fair value assets and liabilities measured on a recurring basis [Line Items] | ' | ' |
Assets at fair value | ' | 1 |
Liabilities at fair value | 1 | ' |
Derivatives: [Member] | Foreign currency [Member] | Level 1 [Member] | ' | ' |
Fair value assets and liabilities measured on a recurring basis [Line Items] | ' | ' |
Assets at fair value | ' | 0 |
Liabilities at fair value | 0 | ' |
Derivatives: [Member] | Foreign currency [Member] | Level 2 [Member] | ' | ' |
Fair value assets and liabilities measured on a recurring basis [Line Items] | ' | ' |
Assets at fair value | ' | 1 |
Liabilities at fair value | 1 | ' |
Derivatives: [Member] | Foreign currency [Member] | Level 3 [Member] | ' | ' |
Fair value assets and liabilities measured on a recurring basis [Line Items] | ' | ' |
Assets at fair value | ' | 0 |
Liabilities at fair value | 0 | ' |
Non-derivatives: [Member] | Available-for-sale securities [Member] | Fair Value [Member] | ' | ' |
Fair value assets and liabilities measured on a recurring basis [Line Items] | ' | ' |
Assets at fair value | 1,402 | ' |
Non-derivatives: [Member] | Available-for-sale securities [Member] | Level 1 [Member] | ' | ' |
Fair value assets and liabilities measured on a recurring basis [Line Items] | ' | ' |
Assets at fair value | 0 | ' |
Non-derivatives: [Member] | Available-for-sale securities [Member] | Level 2 [Member] | ' | ' |
Fair value assets and liabilities measured on a recurring basis [Line Items] | ' | ' |
Assets at fair value | 1,402 | ' |
Non-derivatives: [Member] | Available-for-sale securities [Member] | Level 3 [Member] | ' | ' |
Fair value assets and liabilities measured on a recurring basis [Line Items] | ' | ' |
Assets at fair value | 0 | ' |
Non-derivatives: [Member] | Performance share awards [Member] | Fair Value [Member] | ' | ' |
Fair value assets and liabilities measured on a recurring basis [Line Items] | ' | ' |
Liabilities at fair value | 20 | 14 |
Non-derivatives: [Member] | Performance share awards [Member] | Level 1 [Member] | ' | ' |
Fair value assets and liabilities measured on a recurring basis [Line Items] | ' | ' |
Liabilities at fair value | 20 | 14 |
Non-derivatives: [Member] | Performance share awards [Member] | Level 2 [Member] | ' | ' |
Fair value assets and liabilities measured on a recurring basis [Line Items] | ' | ' |
Liabilities at fair value | 0 | 0 |
Non-derivatives: [Member] | Performance share awards [Member] | Level 3 [Member] | ' | ' |
Fair value assets and liabilities measured on a recurring basis [Line Items] | ' | ' |
Liabilities at fair value | $0 | $0 |