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Accounting Policies - Narrative (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Retained earnings | $ 5,444 |  | $ 6,113
Accounts receivable | 2,025 |  | 1,941
Deferred income taxes | $ 1,261 |  | $ 1,527
Accounting Standards Update 2016-13 | Restatement Adjustment |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Retained earnings |  | $ (12) |
Accounts receivable |  | (15) |
Deferred income taxes |  | $ 3 |

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