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Risk Management Risk Management Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income [Roll Forward]      
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax $ (1) $ 219 $ 327
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax (288) (322) (108)
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax (372) (358) (236)
Accumulated other comprehensive loss (661) (461) (17)
Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax Portion Attributable To Parent 145 (104) 164
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Before Reclassifications, Portion Attributable to Parent 55 34 (214)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax 40 (14) (122)
OCI, before Reclassifications, Net of Tax, Attributable to Parent 240 (84) (172)
Other Comprehensive Income Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax Portion Attributable To Parent (171) (116) (272)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax 0 0 0
Other Comprehensive Income Loss Reclassification Adjustment From AOCI Pension And Other Postretiremen Benefit Plans Net Of Tax Portion Attributable To Parent 0 0 0
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent (171) (116) (272)
Other Comprehensive Income Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax Portion Attributable To Parent, Due to IPO 0    
Other Comprehensive Income, Foreign Currency Translation Adjustment-IPO 44    
Other Comprehensive Income(Loss), Defined Benefit Plan, Reclassification Adjustment from AOCI, due to IPO, net of tax 7    
Other Comprehensive Income, KML IPO 51    
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent (26) (220) (108)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent 99 34 (214)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent 47 (14) (122)
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax (27) (1) 219
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax (189) (288) (322)
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax (325) (372) (358)
Accumulated other comprehensive loss (541) (661) (461)
Net current-period other comprehensive (loss) income $ 120 $ (200) $ (444)