Income Taxes (Details) € in Millions, $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015 EUR (€)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Income Tax Disclosure [Abstract]
Provision for income taxes		$ 467	$ 307	$ 695	$ 782
Discrete tax benefits				197	70
Valuation allowance against the net deferred tax assets		600
Cash taxes paid, net of refunds		447	$ 88	693	$ 226	$ 879	$ 380
Tax contingencies		$ 1,900		1,900		$ 1,900		$ 1,700
Internal Revenue Service (IRS) | Domestic Tax Authority
Income Tax Examination [Line Items]
Tax examination, estimate of additional tax expense				$ 1,500
French Tax Administration | Foreign Tax Authority
Income Tax Examination [Line Items]
Tax examination, estimate of additional tax expense | €	€ 196