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Fair Value Measurements (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Financial Instruments
Cash and cash equivalents	$ 570	$ 580
Short-term investments	$ 0	17
7.25% 2063 Senior Notes
Financial Instruments
Interest rate	7.25%
7.25% 2064 Senior Notes
Financial Instruments
Interest rate	7.25%
6.95% Senior Notes
Financial Instruments
Interest rate	6.95%
6.7% Senior Notes
Financial Instruments
Interest rate	6.70%
Book Value
Financial Instruments
Cash and cash equivalents	$ 570	580
Short-term investments	0	17
Book Value | Retail
Financial Instruments
Long-term debt	917	917
Book Value | Institutional
Financial Instruments
Long-term debt	534	534
Book Value | Other
Financial Instruments
Long-term debt	172	180
Fair Value | Level 1
Financial Instruments
Cash and cash equivalents	570	580
Short-term investments	0	17
Fair Value | Level 2 | Retail
Financial Instruments
Long-term debt	953	850
Fair Value | Level 2 | Institutional
Financial Instruments
Long-term debt	583	531
Fair Value | Level 2 | Other
Financial Instruments
Long-term debt	$ 172	$ 180
Interest rate | Institutional and Other | Minimum
Financial Instruments
Fair value assumption, interest rate	3.80%	5.03%
Interest rate | Institutional and Other | Maximum
Financial Instruments
Fair value assumption, interest rate	5.96%	6.97%

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