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Consolidated Statements of Comprehensive Income (Parentheticals) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Statement of comprehensive income [abstract]        
Net unrealized change on equity investments, net of tax $nil, $nil, $nil and $nil $ 0 $ 0 $ 0 $ 0
Unrealized gains (losses) on derivatives designated as cash flow hedges, net of tax ($3), $3, ($6) and $3 (3) 3 (6) 3
Realized losses on derivatives designated as cash flow hedges, net of tax $nil, ($2), $nil and ($2) 0 (2) 0 (2)
Actuarial gain (loss) on post employment benefit obligations, net of tax $nil, $nil, $nil and $nil 0 0 0 0
Currency translation adjustments, net of tax $nil, $nil, $nil and $nil $ 0 $ 0 $ 0 $ 0