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Supplemental Cash Flow Information - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Other Significant Noncash Transactions [Line Items]
Transfer from Investments	$ 24	$ 179
Non-cash financing activities related to the issuance of shares for vested restricted stock units	56	48
Operating lease, payments	78	76
ROU asset obtained in exchange for operating lease liability	$ 52	521
Accounting Standards Update 2016-02
Other Significant Noncash Transactions [Line Items]
ROU asset obtained in exchange for operating lease liability		$ 488

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- Definition

Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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Value of stock issued during the period upon the conversion of units. An example of a convertible unit is an umbrella partnership real estate investment trust unit (UPREIT unit).

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