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Accounting and Disclosure Changes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2018 | Jun. 30, 2018 | Jun. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cash receipts from operating cash flows |  | $ 2,765 | $ 2,354
Cash receipts from investing cash flows |  | $ (2,286) | (1,211)
Accounting Standards Update 2018-2 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Reclassification of tax effects from accumulated other comprehensive income to retained earnings | $ 58 |  |
Accounting Standards Update 2016-15 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cash receipts from operating cash flows |  |  | (151)
Cash receipts from investing cash flows |  |  | $ 151

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