Equity - AOCI Changes Net of Tax Table (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss), beginning balance	$ 4,401	$ 2,133
Accumulated other comprehensive income (loss), ending balance	(5,341)	4,401
Accumulated net gain (loss) from cash flow hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Accumulated other comprehensive income (loss), beginning balance	12	(23)
Amounts reclassified from accumulated other comprehensive income	33	35
Accumulated other comprehensive income (loss), ending balance	$ 45	$ 12