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Leases - Lessee (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
Lease, Cost [Abstract] |  |  |
Operating leases | $ 136 |  |
Short-term and variable leases | 92 |  |
Total lease cost(a) | 228 |  |
Lease Costs Capitalized | 46 |  |
Lessee, Operating Lease, Description [Abstract] |  |  |
Operating cash flows from operating leases | (182) |  |
Investing cash flows from operating leases | (46) |  |
ROU assets obtained in exchange for operating lease obligations, net of retirements adjusted for currency conversion | 399 |  |
Amortization of ROU assets | $ 75 |  |
Weighted average remaining lease term | 13 years 4 months 24 days |  |
Weighted average discount rate | 4.31% |  |
Assets and Liabilities, Lessee [Abstract] |  |  |
ROU assets | $ 329 |  |
Short-term lease liability | 40 |  |
Long-term lease liability | 289 |  |
Finance lease assets | 2 |  |
Finance lease liabilities | 2 |  |
Lessee, Operating Lease, Liability, Payment, Due [Abstract] |  |  |
2020 | 55 |  |
2021 | 45 |  |
2022 | 38 |  |
2023 | 32 |  |
2024 | 30 |  |
Thereafter | 267 |  |
Total lease payments | 467 |  |
Less: Interest | (138) |  |
Present value of lease liabilities | 329 |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |
2019 |  |  | $ 115
2020 |  |  | 100
2021 |  |  | 95
2022 |  |  | 91
2023 |  |  | 84
Thereafter |  |  | 859
Total payments |  |  | 1,344
Leases |  |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |
2019 |  |  | 90
2020 |  |  | 75
2021 |  |  | 70
2022 |  |  | 65
2023 |  |  | 59
Thereafter |  |  | 771
Total payments |  |  | 1,130
ROW |  |  |
Lessee, Operating Lease, Liability, Payment, Due [Abstract] |  |  |
Total lease payments | 202 |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |
2019 |  |  | 25
2020 |  |  | 25
2021 |  |  | 25
2022 |  |  | 26
2023 |  |  | 25
Thereafter |  |  | 88
Total payments |  |  | 214
Edmonton South Property |  |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |
Total payments |  |  | 482
KML and U.S. Portion of Cochin Pipeline |  |  |
Lessee, Operating Lease, Description [Abstract] |  |  |
Removal of ROU assets and liabilities associated with the KML and U.S. Cochin Sale | (394) |  |
KML and U.S. Portion of Cochin Pipeline | Leases |  |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |
Total payments |  |  | $ 695
Amount Excluding Cumulative Adjustment |  |  |
Lessee, Operating Lease, Description [Abstract] |  |  |
ROU assets obtained in exchange for operating lease obligations, net of retirements adjusted for currency conversion | $ 102 |  |
Accounting Standards Update 2016-02 |  |  |
Assets and Liabilities, Lessee [Abstract] |  |  |
ROU assets |  | $ 696 |
Short-term lease liability |  | 52 |
Long-term lease liability |  | $ 644 |

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