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Performance B.4.1. Share-based compensation - Plan awards and shares expected to vest (Details) $ in Millions | 12 Months Ended | 24 Months Ended | 36 Months Ended | 48 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 shares | Dec. 31, 2016 shares | Dec. 31, 2015 shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2018 USD ($) shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Shares issued (in shares) | (207,092) | (136,047) |  |  |  |  |
Shares still expected to vest (in shares) | 512,211 | 447,391 |  |  | 512,211 | 512,211 | 512,211
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) | (13,531) |  |  |  |  |  |
Revision for cancellations (in shares) | (4,728) |  |  |  |  |  |
Total before issuances (in shares) | 218,927 |  |  |  |  |  |
Shares issued (in shares) | (97) |  |  |  |  |  |
Shares still expected to vest (in shares) | 218,830 |  |  |  | 218,830 | 218,830 | 218,830
Estimated cost over the vesting period (US$ millions) | $ | $ 12 |  |  |  | $ 12 | $ 12 | $ 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) | (18,086) |  |  |  |  |  |
Revision for cancellations (in shares) | 0 |  |  |  |  |  |
Total before issuances (in shares) | 247,521 |  |  |  |  |  |
Shares issued (in shares) | (18,747) |  |  |  |  |  |
Shares still expected to vest (in shares) | 228,774 |  |  |  | 228,774 | 228,774 | 228,774
Estimated cost over the vesting period (US$ millions) | $ | $ 14 |  |  |  | $ 14 | $ 14 | $ 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) |  |  |  |  | (34,556) |  |
Revision for cancellations (in shares) |  |  |  |  | 0 |  |
Total before issuances (in shares) |  |  |  |  | 248,119 |  |
Shares issued (in shares) | (2,724) | 0 |  |  |  |  |
Shares still expected to vest (in shares) | 245,395 |  |  |  | 245,395 | 245,395 | 245,395
Estimated cost over the vesting period (US$ millions) | $ | $ 9 |  |  |  | $ 9 | $ 9 | $ 9
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) |  |  |  |  | (74,325) |  |
Revision for cancellations (in shares) |  |  |  |  | 0 |  |
Total before issuances (in shares) |  |  |  |  | 393,586 |  |
Shares issued (in shares) | (99,399) | (2,686) |  |  |  |  |
Shares still expected to vest (in shares) | 291,501 |  |  |  | 291,501 | 291,501 | 291,501
Estimated cost over the vesting period (US$ millions) | $ | $ 20 |  |  |  | $ 20 | $ 20 | $ 20
2016 Performance Plan |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Initial shares granted (in shares) |  |  | 200,617 |  |  |  |
Additional shares granted (in shares) |  |  |  |  |  | 0 |
Revision for forfeitures (in shares) |  |  |  |  |  | (49,164) |
Revision for cancellations (in shares) |  |  |  |  |  | 0 |
Total before issuances (in shares) |  |  |  |  |  | 151,453 |
Shares issued (in shares) | (2,050) | (752) | (1,214) |  |  |  |
Shares still expected to vest (in shares) | 147,437 |  |  |  | 147,437 | 147,437 | 147,437
Estimated cost over the vesting period (US$ millions) | $ | $ 8 |  |  |  | $ 8 | $ 8 | $ 8
2016 Deferred Plan |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Initial shares granted (in shares) |  |  | 287,316 |  |  |  |
Additional shares granted (in shares) |  |  |  |  |  | 0 |
Revision for forfeitures (in shares) |  |  |  |  |  | (77,924) |
Revision for cancellations (in shares) |  |  |  |  |  | 0 |
Total before issuances (in shares) |  |  |  |  |  | 209,392 |
Shares issued (in shares) | (46,039) | (43,579) | (1,733) |  |  |  |
Shares still expected to vest (in shares) | 118,041 |  |  |  | 118,041 | 118,041 | 118,041
Estimated cost over the vesting period (US$ millions) | $ | $ 12 |  |  |  | $ 12 | $ 12 | $ 12
2015 Deferred Plan |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Initial shares granted (in shares) |  |  |  | 237,620 |  |  |
Additional shares granted (in shares) |  |  |  |  |  |  | 0
Revision for forfeitures (in shares) |  |  |  |  |  |  | (68,121)
Revision for cancellations (in shares) |  |  |  |  |  |  | 0
Total before issuances (in shares) |  |  |  |  |  |  | 169,499
Shares issued (in shares) | (100,630) | (30,124) | (38,745) |  |  |  |
Estimated cost over the vesting period (US$ millions) | $ | $ 12 |  |  |  | 12 | 12 | $ 12
2015 CEO Plan |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Initial shares granted (in shares) |  |  |  | 77,344 |  |  |
Additional shares granted (in shares) |  |  |  |  |  |  | 3,537
Revision for forfeitures (in shares) |  |  |  |  |  |  | 0
Revision for cancellations (in shares) |  |  |  |  |  |  | 0
Total before issuances (in shares) |  |  |  |  |  |  | 80,881
Shares issued (in shares) | (26,961) | (28,139) | (25,781) |  |  |  |
Estimated cost over the vesting period (US$ millions) | $ | $ 6 |  |  |  | 6 | 6 | $ 6
2015 Executive Plan |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Initial shares granted (in shares) |  |  |  | 40,664 |  |  |
Additional shares granted (in shares) |  |  |  |  |  |  | 0
Revision for forfeitures (in shares) |  |  |  |  |  |  | 0
Revision for cancellations (in shares) |  |  |  |  |  |  | 0
Total before issuances (in shares) |  |  |  |  |  |  | 40,664
Shares issued (in shares) | (19,022) | 0 | 0 |  |  |  |
Performance conditions |  |  |  |  |  |  | (21,642)
Estimated cost over the vesting period (US$ millions) | $ | $ 2 |  |  |  | 2 | 2 | $ 2
2015 Performance Plan |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Initial shares granted (in shares) |  |  |  | 98,137 |  |  |
Additional shares granted (in shares) |  |  |  |  |  |  | 0
Revision for forfeitures (in shares) |  |  |  |  |  |  | (37,452)
Revision for cancellations (in shares) |  |  |  |  |  |  | 0
Total before issuances (in shares) |  |  |  |  |  |  | 60,685
Shares issued (in shares) | (27,619) | (357) | (771) |  |  |  |
Performance conditions |  |  |  |  |  |  | (31,938)
Estimated cost over the vesting period (US$ millions) | $ | $ 4 |  |  |  | $ 4 | $ 4 | $ 4

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