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Debt - Summary of outstanding debt (Details) € in Millions, CAD in Millions | Dec. 31, 2016 USD ($) | Dec. 31, 2016 CAD | Dec. 31, 2016 EUR (€) | May 27, 2016 USD ($) | Mar. 01, 2016 USD ($) | Dec. 31, 2015 USD ($) | Nov. 13, 2015 USD ($) | May 20, 2015 USD ($)
--- | --- | --- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total debt | $ 6,205,000,000 |  |  |  |  | $ 5,700,000,000 |  |
Less short-term and current portion of long-term debt | 336,000,000 |  |  |  |  | 562,000,000 |  |
Long-term debt | 5,869,000,000 |  |  |  |  | 5,138,000,000 |  |
Commercial Paper |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total debt | 329,000,000 |  |  |  |  | 50,000,000 |  |
Other |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total debt | 9,000,000 |  |  |  |  | 15,000,000 |  |
3.875% Senior Notes due December 2025 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total debt | $ 744,000,000 |  |  |  |  | 0 |  |
Interest rate on debt | 3.875% | 3.875% | 3.875% |  |  |  |  |
Debt face value |  |  |  |  | $ 750,000,000 |  |  |
5.00% Senior Notes due September 2020 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total debt | $ 598,000,000 |  |  |  |  | 597,000,000 |  |
Interest rate on debt | 5.00% | 5.00% | 5.00% |  |  |  |  |
4.75% Senior Notes due May 2045 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total debt | $ 592,000,000 |  |  |  |  | 591,000,000 |  |
Interest rate on debt | 4.75% | 4.75% | 4.75% |  |  |  |  |
Debt face value |  |  |  |  |  |  |  | $ 600,000,000
3.50% Senior Notes due June 2024 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total debt | $ 594,000,000 |  |  |  |  | 593,000,000 |  |
Interest rate on debt | 3.50% | 3.50% | 3.50% |  |  |  |  |
4.60% Senior Notes due June 2044 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total debt | $ 543,000,000 |  |  |  |  | 543,000,000 |  |
Interest rate on debt | 4.60% | 4.60% | 4.60% |  |  |  |  |
2.875% Senior Notes due May 2026 (EUR 500M) | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total debt | $ 516,000,000 |  |  |  |  | 541,000,000 |  |
Interest rate on debt | 2.875% | 2.875% | 2.875% |  |  |  |  |
Debt face value | € |  |  | € 500 |  |  |  |  |
8.205% Junior Subordinated Notes due January 2027 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total debt | $ 521,000,000 |  |  |  |  | 521,000,000 |  |
Interest rate on debt | 8.205% | 8.205% | 8.205% |  |  |  |  |
3.125% Senior Notes due May 2016 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total debt | $ 0 |  |  |  |  | 500,000,000 |  |
Interest rate on debt | 3.125% | 3.125% | 3.125% |  |  |  |  |
Debt face value |  |  |  | $ 500,000,000 |  |  |  |
2.80% Senior Notes due March 2021 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total debt | $ 397,000,000 |  |  |  |  | 396,000,000 |  |
Interest rate on debt | 2.80% | 2.80% | 2.80% |  |  |  |  |
Debt face value |  |  |  |  |  |  | $ 400,000,000 |
4.00% Senior Notes due November 2023 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total debt | $ 347,000,000 |  |  |  |  | 347,000,000 |  |
Interest rate on debt | 4.00% | 4.00% | 4.00% |  |  |  |  |
6.25% Senior Notes due September 2040 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total debt | $ 295,000,000 |  |  |  |  | 295,000,000 |  |
Interest rate on debt | 6.25% | 6.25% | 6.25% |  |  |  |  |
4.76% Senior Notes due March 2018 (CAD 375M) | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total debt | $ 277,000,000 |  |  |  |  | 270,000,000 |  |
Interest rate on debt | 4.76% | 4.76% | 4.76% |  |  |  |  |
Debt face value | CAD |  | CAD 375 |  |  |  |  |  |
4.45% Senior Notes due May 2043 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total debt | $ 246,000,000 |  |  |  |  | 246,000,000 |  |
Interest rate on debt | 4.45% | 4.45% | 4.45% |  |  |  |  |
4.25% Senior Notes due December 2042 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total debt | $ 197,000,000 |  |  |  |  | $ 195,000,000 |  |
Interest rate on debt | 4.25% | 4.25% | 4.25% |  |  |  |  |

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