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Contractual interest rate for funds borrowed, under the debt agreement.

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Gross amount of debt extinguished.

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Debt - Recourse Debt (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
Debt - Recourse Debt (Details) - USD ($) $ in Millions	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Debt Instrument [Line Items]
Borrowings under the revolving credit facilities				$ 998	$ 1,318
Loss on extinguishment of debt	$ (18)	$ (40)		$ (19)	(41)
Corporate and Other [Member]
Debt Instrument [Line Items]
Loss on extinguishment of debt					(37)
Corporate and Other [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Borrowings under the revolving credit facilities			$ 840
Corporate and Other [Member] \| 3.95% Senior Notes due 2030 [Domain] \| Senior Notes [Member]
Debt Instrument [Line Items]
Issued senior notes		$ 700			$ 700
Debt Instrument, Interest Rate, Stated Percentage		3.95%			3.95%
Corporate and Other [Member] \| 3.30% Senior Notes due 2025 [Domain] \| Senior Notes [Member]
Debt Instrument [Line Items]
Issued senior notes		$ 900			$ 900
Debt Instrument, Interest Rate, Stated Percentage		3.30%			3.30%
Corporate and Other [Member] \| 4.0% Senior Notes Due 2021 [Domain] [Domain] \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4.00%			4.00%
Corporate and Other [Member] \| 4.5% Senior Notes Due 2023 [Domain] [Domain] \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4.50%			4.50%
Redeemed notes					$ 7
Corporate and Other [Member] \| 4.875% Senior Notes Due 2023 [Member] [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4.875%			4.875%
Corporate and Other [Member] \| Liquidity [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Borrowings under the revolving credit facilities			250
Repayments of Debt		$ 250
Corporate and Other [Member] \| Other General [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Borrowings under the revolving credit facilities			$ 590