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Financial Instruments - Long-Term Debt Narrative (Details) £ in Millions | 1 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2019 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 GBP (£) | Nov. 30, 2016 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | [1] | Jan. 31, 2019 EUR (€) | Dec. 31, 2017 EUR (€) | Dec. 31, 2017 GBP (£) | Mar. 17, 2017 USD ($) | Mar. 06, 2017 EUR (€) | Nov. 21, 2016 USD ($) | Jun. 03, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchased debt |  |  |  |  | $ 3,400,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Redemption value |  |  |  |  | 3,700,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Loss on early retirement of debt |  |  | $ 999,000,000 |  | 312,000,000 | $ 3,000,000 | [1] | $ 999,000,000 | [1] | $ 312,000,000 |  |  |  |  |  |  |
Senior Unsecured U.K. Pound Debt, 6.50%, Due 2038 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on early retirement of debt |  |  | 846,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Unsecured Euro Debt, 5.75%, Due 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on early retirement of debt |  |  | $ 153,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate |  |  |  |  |  | 3.56% |  |  |  |  |  |  |  |  |  |  |
Principal amount | [2] |  |  |  |  | $ 5,000,000,000 |  |  |  |  |  |  |  |  |  |  |
Senior Notes [Member] | Senior Unsecured U.K. Pound Debt, 6.50%, Due 2038 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchased debt | £ |  |  |  |  |  |  |  |  |  |  |  |  | £ 197 |  |  |  |
Interest rate, percentage |  |  |  |  |  |  |  |  |  |  |  | 6.50% | 6.50% |  |  |  |
Redemption value | £ |  |  |  |  |  |  |  |  |  |  |  |  | £ 1,700 |  |  |  |
Amount of debt exchanged |  |  |  | £ 833 |  |  |  | $ 1,100,000,000 |  |  |  |  |  |  |  |  |
Principal amount | £ |  |  |  |  |  |  |  |  |  |  |  |  | £ 470 |  |  |  |
Senior Notes [Member] | Senior Unsecured Euro Debt, 5.75%, Due 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchased debt | € |  |  |  |  |  |  |  |  |  |  |  | € 834,000,000 |  |  |  |  |
Interest rate, percentage |  |  |  |  |  |  |  |  |  |  |  | 5.75% | 5.75% |  |  |  |
Redemption value | € |  |  |  |  |  |  |  |  |  |  |  | € 1,000,000,000 |  |  |  |  |
Principal amount | € |  |  |  |  |  |  |  |  |  |  |  | € 1,200,000,000 |  |  |  |  |
Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,065,000,000 | € 4,000,000,000 | $ 6,000,000,000 | $ 5,000,000,000
Weighted average interest rate |  |  |  |  |  | 1.30% |  |  |  |  |  | 2.40% | 2.40% | 4.20% | 0.23% | 3.10% | 2.09%
Principal amount |  |  |  |  |  | $ 1,800,000,000 |  |  |  |  |  |  |  |  |  |  |
Unsecured Debt [Member] | Senior Unsecured Debt, 6.20%, Due 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchased debt |  |  |  |  | $ 3,270,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, percentage |  |  |  |  | 6.20% |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Senior Unsecured Euro Debt, 5.75%, Due 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on early retirement of debt |  | $ (138,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Senior Notes [Member] | Senior Unsecured Euro Debt, 5.75%, Due 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchased debt | € |  |  |  |  |  |  |  |  |  |  | € 1,100,000,000 |  |  |  |  |  |
Interest rate, percentage |  |  |  |  |  |  |  |  |  |  | 5.75% |  |  |  |  |  |
Redemption value | € |  |  |  |  |  |  |  |  |  |  | € 1,300,000,000 |  |  |  |  |  |
[1] | In 2017 and 2016, represents net losses due to the early retirement of debt, inclusive of the related termination of cross currency swaps in 2017 and inclusive of the related termination of interest rate swaps in 2016.
[2] | The weighted-average effective interest rate for the notes at issuance was 3.56%.

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