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Supplemental Cash Flow Information - Narrative (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Transfer from Investments | $ 187 | $ 78
Non-cash financing activities related to the issuance of shares for vested restricted stock units | 48 | $ 30
Operating lease, payments | 115 |
ROU asset obtained in exchange for operating lease liability | 534 |
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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- Definition Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918643-209977 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + Details
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