Debt and Equity - Purchase of Senior Notes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Nov. 04, 2022
Debt Instrument [Line Items]
Gain	$ 20	$ 0	$ 28	$ 0
Senior Notes
Debt Instrument [Line Items]
Principal Amount	984		984
Discounts/Deferred Issuance Costs	11		11
Book Value			973
Redemption Value	935		935
Gain	20		38
Senior Notes | Subsequent event
Debt Instrument [Line Items]
Principal Amount					$ 78
Redemption Value					$ 72
5.00% Senior Notes due 2027 | Senior Notes
Debt Instrument [Line Items]
Principal Amount	103		103
Discounts/Deferred Issuance Costs	1		1
Book Value			102
Redemption Value	102		102
Gain			0
4.125% Senior Notes due 2028 | Senior Notes
Debt Instrument [Line Items]
Principal Amount	133		133
Discounts/Deferred Issuance Costs	1		1
Book Value			132
Redemption Value	126		126
Gain			6
4.375% Senior Notes due 2028 | Senior Notes
Debt Instrument [Line Items]
Principal Amount	166		166
Discounts/Deferred Issuance Costs	2		2
Book Value			164
Redemption Value	158		158
Gain			6
5.25% Senior Notes due 2029 | Senior Notes
Debt Instrument [Line Items]
Principal Amount	97		97
Discounts/Deferred Issuance Costs	2		2
Book Value			95
Redemption Value	93		93
Gain			2
4.25% Senior Notes due 2030 | Senior Notes
Debt Instrument [Line Items]
Principal Amount	76		76
Discounts/Deferred Issuance Costs	1		1
Book Value			75
Redemption Value	71		71
Gain			4
4.625% Senior Notes due 2030 | Senior Notes
Debt Instrument [Line Items]
Principal Amount	229		229
Discounts/Deferred Issuance Costs	2		2
Book Value			227
Redemption Value	215		215
Gain			12
5.40% Senior Notes due 2034 | Senior Notes
Debt Instrument [Line Items]
Principal Amount	20		20
Discounts/Deferred Issuance Costs	0		0
Book Value			20
Redemption Value	20		20
Gain			0
5.450% Senior Notes due 2043 | Senior Notes
Debt Instrument [Line Items]
Principal Amount	160		160
Discounts/Deferred Issuance Costs	2		2
Book Value			158
Redemption Value	$ 150		150
Gain			$ 8