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Equity (AOCI) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
AOCI roll forward |  |  |
Balance | $ 13,114 | $ 12,711 | $ 15,805
Other comprehensive income (loss) attributable to controlling interest | (21) | 11 | (7)
Balance | 11,867 | 13,114 | 12,711
Defined benefit pension plans |  |  |
AOCI roll forward |  |  |
Balance | (279) | (290) |
Other comprehensive income (loss) before reclassifications | (25) | 6 |
Reclassifications to net income | 4 | 5 |
Other comprehensive income (loss) attributable to controlling interest | (21) | 11 |
Effect of adopting accounting standards update | (24) |  |
Balance | $ (324) | $ (279) | $ (290)

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