Investments in Unconsolidated Subsidiaries, Equity Securities and Other Related Parties (Narrative) (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
Jun. 30, 2019	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 1,074	$ 981
Difference between equity method investment carrying value and book value	903	835
Dividends from unconsolidated subsidiaries	$ 17	118
PMM [Member] \| TTI [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	33.00%
STAEM [Member] \| EITA [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	51.00%
STAEM [Member] \| Management Et Developpement Des Actifs Et Des Ressources Holding (MADAR Holding) [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	49.00%
Godfrey Phillips India Ltd [Member] \| IPM India [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	43.70%
Minimum [Member]
Schedule of Equity Method Investments [Line Items]
Difference between equity method investment carrying value and book value, amortization period	10 years
Maximum [Member]
Schedule of Equity Method Investments [Line Items]
Difference between equity method investment carrying value and book value, amortization period	20 years
Equity Method Investment Goodwill [Member]
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated subsidiaries and equity securities	$ 860	$ 793
EITA [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	49.00%
STAEM [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	25.00%
Megapolis Group
Schedule of Equity Method Investments [Line Items]
Ownership percentage	23.00%
RBH [Member]
Schedule of Equity Method Investments [Line Items]
Equity securities	$ 3,280

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