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Non-Marketable Investments (Rollforward of Other Marketable Investments) (Details) - Non-Marketable Debt Securities - Level 3 - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Other Investments Not Readily Marketable    
Beginning balance $ 1,165 $ 1,024
Total net gains (losses)    
Included in earnings (5) 0
Included in other comprehensive income 699 100
Purchases 85 78
Sales (1) (7)
Settlements (54) (16)
Ending balance $ 1,889 $ 1,179