Equity Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent			$ (284)
Other Comprehensive Income (Loss), Net of Tax	$ 161	$ (236)	(413)	$ (354)
Unfunded pension obligation, Net of Tax	(42)		(42)		$ (38)
Foreign currency translation adjustment, Net of Tax	(1,795)		(1,795)		(1,721)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(2,628)		(2,628)		(2,229)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			(432)
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	(791)		(791)		$ (470)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			148
Total foreign currency translation adjustment, net of income tax	110	(75)	(27)	(44)
Total change in derivative fair value, net of income tax	50	(161)	(387)	(339)
Total pension adjustments, net of income tax	1	$ 0	1	$ 29
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			(388)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			69
Total change in derivative fair value, net of income tax			(319)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			(1)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			1
Total pension adjustments, net of income tax			0
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			(43)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			78
Total foreign currency translation adjustment, net of income tax			35
Gener Subsidiary [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Foreign currency translation adjustment, Net of Tax	(109)		(109)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(115)		(115)
Gener Subsidiary [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	(2)		(2)
Gener Subsidiary [Member] | Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unfunded pension obligation, Net of Tax	$ (4)		$ (4)