Cash inflows associated with the issuance of non-recourse debt.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Gross amount of debt extinguished.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Fair value of the amount outstanding under the credit facility.

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The effective interest rate at the end of the reporting period.

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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Debt - Recourse Debt (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended	9 Months Ended
Debt - Recourse Debt (Details) - USD ($) $ in Millions	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt	$ (54)			$ (65)		$ (95)	$ (126)
Repayments of Lines of Credit						1,515	1,041
Proceeds From Issuance Of Nonrecourse Debt						4,229	3,580
Nonrecourse Debt [Member] \| Cochrane Subsidiary [Member]
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt						1
Proceeds From Issuance Of Nonrecourse Debt						485
Repayments of Long-term Debt						$ (445)
London Interbank Offered Rate (LIBOR) [Member] \| LIBOR 1.75% Term Loan Due In 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate						1.75%
Corporate and Other [Member]
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt		$ (37)					5
Corporate and Other [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Proceeds from Lines of Credit			$ 840		$ 600
Line of Credit Facility, Fair Value of Amount Outstanding	$ 710				$ 710	$ 710
Debt, Weighted Average Interest Rate	1.86%				1.86%	1.86%
Repayments of Debt					$ 695
Corporate and Other [Member] \| LIBOR 1.75% Term Loan Due In 2022 [Member]
Debt Instrument [Line Items]
Redeemed notes							343
Corporate and Other [Member] \| 4.875% Senior Notes Due 2023 [Member] [Member]
Debt Instrument [Line Items]
Redeemed notes							$ 100
Corporate and Other [Member] \| Senior Notes [Member] \| 4.0% Senior Notes Due 2021 [Domain] [Domain]
Debt Instrument [Line Items]
Interest rate on senior notes	4.00%				4.00%	4.00%
Corporate and Other [Member] \| Senior Notes [Member] \| 4.5% Senior Notes Due 2023 [Domain] [Domain]
Debt Instrument [Line Items]
Redeemed notes						$ 7
Interest rate on senior notes	4.50%				4.50%	4.50%
Corporate and Other [Member] \| Senior Notes [Member] \| 4.875% Senior Notes Due 2023 [Member] [Member]
Debt Instrument [Line Items]
Interest rate on senior notes	4.875%			4.875%	4.875%	4.875%	4.875%
Corporate and Other [Member] \| Senior Notes [Member] \| 3.30% Senior Notes due 2025 [Domain]
Debt Instrument [Line Items]
Interest rate on senior notes	3.30%				3.30%	3.30%
Issued senior notes	$ 900				$ 900	$ 900
Corporate and Other [Member] \| Senior Notes [Member] \| 3.95% Senior Notes due 2030 [Domain]
Debt Instrument [Line Items]
Interest rate on senior notes	3.95%				3.95%	3.95%
Issued senior notes	$ 700				$ 700	$ 700
Corporate and Other [Member] \| Liquidity [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Proceeds from Lines of Credit			250
Repayments of Debt		$ 250
Corporate and Other [Member] \| Other General [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Proceeds from Lines of Credit			$ 590