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Performance B.4.1. Share-based compensation - Plan awards and shares expected to vest (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 shares | Dec. 31, 2018 shares | Dec. 31, 2017 shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Shares issued (in shares) | (364,157) | (326,883) |  |
Shares still expected to vest (in shares) | 622,567 | 570,404 |  |
2020 Performance Plan |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Initial shares granted (in shares) | 341,897 |  |  |
Additional shares granted (in shares) | 0 |  |  |
Revision for forfeitures (in shares) | (13,008) |  |  |
Revision for cancellations (in shares) | 0 |  |  |
Total before issuances (in shares) | 328,889 |  |  |
Shares issued (in shares) | 0 |  |  |
Performance conditions (in shares) | 0 |  |  |
Shares still expected to vest (in shares) | 328,889 |  |  |
Estimated cost over the vesting period | $ | $ 13 |  |  |
2020 Deferred Plan |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Initial shares granted (in shares) | 370,131 |  |  |
Additional shares granted (in shares) | 5,928 |  |  |
Revision for forfeitures (in shares) | (9,880) |  |  |
Revision for cancellations (in shares) | 0 |  |  |
Total before issuances (in shares) | 366,179 |  |  |
Shares issued (in shares) | (3,571) |  |  |
Performance conditions (in shares) | 0 |  |  |
Shares still expected to vest (in shares) | 362,608 |  |  |
Estimated cost over the vesting period | $ | $ 15 |  |  |
2019 Performance Plan |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Initial shares granted (in shares) | 257,601 |  |  |
Additional shares granted (in shares) | 0 |  |  |
Revision for forfeitures (in shares) | (35,558) |  |  |
Revision for cancellations (in shares) | 0 |  |  |
Total before issuances (in shares) | 222,043 |  |  |
Shares issued (in shares) | (17) | (150) |  |
Performance conditions (in shares) | 0 |  |  |
Shares still expected to vest (in shares) | 221,876 |  |  |
Estimated cost over the vesting period | $ | $ 11 |  |  |
2019 Deferred Plan |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Initial shares granted (in shares) | 297,856 |  |  |
Additional shares granted (in shares) | 43,115 |  |  |
Revision for forfeitures (in shares) | (22,636) |  |  |
Revision for cancellations (in shares) | 0 |  |  |
Total before issuances (in shares) | 318,335 |  |  |
Shares issued (in shares) | (96,629) | (24,294) |  |
Performance conditions (in shares) | 0 |  |  |
Shares still expected to vest (in shares) | 197,412 |  |  |
Estimated cost over the vesting period | $ | $ 18 |  |  |
2018 Performance Plan |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Initial shares granted (in shares) | 237,196 |  |  |
Additional shares granted (in shares) | 0 |  |  |
Revision for forfeitures (in shares) | (43,639) |  |  |
Revision for cancellations (in shares) | (4,728) |  |  |
Total before issuances (in shares) | 188,829 |  |  |
Shares issued (in shares) | (304) | (3,109) | (97) |
Performance conditions (in shares) | 0 |  |  |
Shares still expected to vest (in shares) | 185,319 |  |  |
Estimated cost over the vesting period | $ | $ 12 |  |  |
2018 Deferred Plan |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Initial shares granted (in shares) | 262,317 |  |  |
Additional shares granted (in shares) | 3,290 |  |  |
Revision for forfeitures (in shares) | (37,433) |  |  |
Revision for cancellations (in shares) | 0 |  |  |
Total before issuances (in shares) | 228,174 |  |  |
Shares issued (in shares) | (35,125) | (54,971) | (18,747) |
Performance conditions (in shares) | 0 |  |  |
Shares still expected to vest (in shares) | 119,331 |  |  |
Estimated cost over the vesting period | $ | $ 14 |  |  |
2017 Performance Plan |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Initial shares granted (in shares) | 279,807 |  |  |
Additional shares granted (in shares) | 2,868 |  |  |
Revision for forfeitures (in shares) | (50,279) |  |  |
Revision for cancellations (in shares) | 0 |  |  |
Total before issuances (in shares) | 232,396 |  |  |
Shares issued (in shares) | (158,394) | (19,143) | (2,724) | 0
Performance conditions (in shares) | (52,135) |  |  |
Shares still expected to vest (in shares) | 0 |  |  |
Estimated cost over the vesting period | $ | $ 10 |  |  |
2017 Deferred Plan |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Initial shares granted (in shares) | 438,505 |  |  |
Additional shares granted (in shares) | 29,406 |  |  |
Revision for forfeitures (in shares) | (89,011) |  |  |
Revision for cancellations (in shares) | 0 |  |  |
Total before issuances (in shares) | 378,900 |  |  |
Shares issued (in shares) | (194,329) | (82,486) | (99,399) | (2,686)
Performance conditions (in shares) | 0 |  |  |
Shares still expected to vest (in shares) | 0 |  |  |
Estimated cost over the vesting period | $ | $ 20 |  |  |

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