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Supplemental financial information - Accumulated other comprehensive income (loss), net of taxes (AOCI) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
[1]
Dec. 31, 2017
Supplemental Financial Information [Abstract]    
Net actuarial loss $ (473) $ (394)
Prior service credit 2 10
Cash flow hedge derivative instruments (2) 0
Total $ (473) $ (384)
[1] Includes $30 million for the adoption of ASU 2018-02. See Note 2 for additional information.