Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Litigation and Regulatory Matters (Details)

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Commitments and Contingencies - Litigation and Regulatory Matters (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Commitments and Contingencies Disclosure [Abstract]        
Litigation settlement expense $ 140,000,000 $ 250,000,000 $ 606,000,000 $ 908,000,000
Minimum        
Loss Contingencies [Line Items]        
Estimated range of possible loss 0   0  
Maximum        
Loss Contingencies [Line Items]        
Estimated range of possible loss $ 1,500,000,000   $ 1,500,000,000