Commitments and Contingencies - Litigation and Regulatory Matters (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Loss Contingencies [Line Items]
Litigation settlement expense	$ 55,000,000	$ 57,000,000	$ 89,000,000	$ 81,000,000
Minimum
Loss Contingencies [Line Items]
Estimated range of possible loss	0		0
Maximum
Loss Contingencies [Line Items]
Estimated range of possible loss	$ 1,300,000,000		$ 1,300,000,000