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Summary of Accounting Policies - Impact of Adopting New Accounting Standards (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Assets |  |  |
Accounts receivable | $ 7,071 |  | $ 6,873
Liabilities |  |  |
Income taxes payable | 1,971 |  | 708
Debt | 5,308 |  | 3,057
Deferred Income Taxes | 1,702 |  | 2,219
Equity |  |  |
Retained earnings | 42,579 |  | 41,350
Accumulated other comprehensive loss | (5,545) |  | $ (4,910)
ASU 2016-01 (Financial Instruments) |  |  |
Equity |  |  |
Retained earnings |  | $ 8 |
Accumulated other comprehensive loss |  | (8) |
ASU 2016-16 (Intra-Entity Transfers Other than Inventory) |  |  |
Liabilities |  |  |
Deferred Income Taxes | (54) | (54) |
Equity |  |  |
Retained earnings |  | 54 |
ASU 2017-12 (Derivatives and Hedging) |  |  |
Liabilities |  |  |
Income taxes payable |  | (3) |
Debt |  | 14 |
Equity |  |  |
Retained earnings |  | (11) |
ASU 2018-02 (Reclassification of Certain Tax Effects) |  |  |
Equity |  |  |
Retained earnings |  | 266 |
Accumulated other comprehensive loss |  | (266) |
Adjustments for New Accounting Pronouncement |  |  |
Assets |  |  |
Accounts receivable |  | 5 |
Liabilities |  |  |
Income taxes payable |  | (3) |
Debt |  | 14 |
Deferred Income Taxes |  | (54) |
Equity |  |  |
Retained earnings |  | 322 |
Accumulated other comprehensive loss |  | (274) |
Effects of Adopting ASC 606 | ASU 2014-09 (Revenue) |  |  |
Assets |  |  |
Accounts receivable | (13) | 5 |
Liabilities |  |  |
Income taxes payable | (1) |  |
Equity |  |  |
Retained earnings | $ (2) | $ 5 |

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