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Supplemental Cash Flow Information - Narrative (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Transfer from Investments | $ 179 | $ 41
Non-cash financing activities related to the issuance of shares for vested restricted stock units | 48 | $ 30
Operating lease, payments | 76 |
ROU asset obtained in exchange for operating lease liability | 521 |
Accounting Standards Update 2016-02 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
ROU asset obtained in exchange for operating lease liability | $ 488 |

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