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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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