Label	Element	Value
Common Stock Including Additional Paid in Capital [Member]
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	$ 21,438,000,000
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	21,345,000,000
AOCI Attributable to Parent [Member]
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	123,000,000
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	(531,000,000)
Treasury Stock [Member]
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	(2,049,000,000)
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	(3,088,000,000)
Accounting Standards Update 2016-13 [Member] | AOCI Attributable to Parent [Member]
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	0
Accounting Standards Update 2017-08 [Member]
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	(2,000,000)
Accounting Standards Update 2017-08 [Member] | AOCI Attributable to Parent [Member]
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	8,000,000
Accounting Standards Update 2017-08 [Member] | Retained Earnings [Member]
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	$ (10,000,000)