The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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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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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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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, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2021
Debt Instrument [Line Items]
Borrowings under the revolving credit facilities							$ 1,251	$ 2,099
Loss on extinguishment of debt	$ (22)	$ (54)					(41)	$ (95)
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	$ 600
Repayments of Debt					$ 695
Line of Credit Facility, Average Outstanding Amount							0
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] \| Revolving Credit Facility due 2026 \| Senior Notes [Member]
Debt Instrument [Line Items]
Issued senior notes	1,250						1,250
Corporate and Other [Member] \| Revolving Credit Facility due 2024 \| Senior Notes [Member]
Debt Instrument [Line Items]
Issued senior notes									$ 1,000
Corporate and Other [Member] \| 1.375% Senior Notes due 2026 [Domain] \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt Conversion, Converted Instrument, Amount	798
Corporate and Other [Member] \| 1.375% Senior Notes due 2026 [Domain] \| Senior Notes [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Issued senior notes	$ 800						$ 800
Debt Instrument, Interest Rate, Effective Percentage	1.375%						1.375%
Corporate and Other [Member] \| 1.375% Senior Notes due 2026 [Domain] \| Senior Notes [Member] \| Unsecured Debt [Member]
Debt Instrument [Line Items]
Issued senior notes									$ 800
Debt Instrument, Interest Rate, Effective Percentage									1.375%
Corporate and Other [Member] \| 2.45% Senior Notes due 2031 [Domain] \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt Conversion, Converted Instrument, Amount	$ 997
Corporate and Other [Member] \| 2.45% Senior Notes due 2031 [Domain] \| Senior Notes [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Issued senior notes	$ 1,000						$ 1,000
Debt Instrument, Interest Rate, Effective Percentage	2.45%						2.45%
Corporate and Other [Member] \| 2.45% Senior Notes due 2031 [Domain] \| Senior Notes [Member] \| Unsecured Debt [Member]
Debt Instrument [Line Items]
Issued senior notes									$ 1,000
Debt Instrument, Interest Rate, Effective Percentage									2.45%
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