Equity - Stock Repurchase Activities (Details) - USD ($) $ / shares in Units, shares in Millions		1 Months Ended	3 Months Ended		5 Months Ended
	Oct. 28, 2019	Oct. 31, 2019	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Jan. 31, 2018
Accelerated Share Repurchases [Line Items]
Common stock received, aggregate price			$ 243,200,000	$ 2,900,000
Stock Repurchase Program 2018
Accelerated Share Repurchases [Line Items]
Stock repurchase program, authorized amount		$ 3,000,000,000.0				$ 2,000,000,000.0
Stock repurchase program, increase to authorized amount		$ 1,000,000,000.0
Stock repurchased and retired (in shares)			10.3	0.0
Common stock received, aggregate price			$ 200,000,000.0	$ 0
Stock repurchased (in shares)			8.5
Common stock repurchased, average cost per share (in dollars per share)			$ 23.70
Stock repurchase program, remaining authorized repurchase amount			$ 1,500,000,000		$ 1,500,000,000
Accelerated Share Repurchase Program
Accelerated Share Repurchases [Line Items]
Stock repurchase program, authorized amount	$ 200,000,000.0
Stock repurchased and retired (in shares)	6.4		1.8		8.2
Common stock received, aggregate price	$ 160,000,000.0
Common stock repurchased under stock repurchase program market price (in usd per share)	$ 25.15
Weighted average repurchase price, stock repurchased and retired during period					$ 24.44