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Significant Accounting Policies - New Accounting Pronouncements (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle      
Retained earnings $ 39,442   $ 39,115
ASU 2016-16 Intra-Entity Transfers of Assets Other Than Inventory | Maximum      
New Accounting Pronouncements or Change in Accounting Principle      
Retained earnings   $ (2)  
Difference between Revenue Guidance in Effect before and after Topic 606 | Maximum      
New Accounting Pronouncements or Change in Accounting Principle      
Retained earnings   $ 2